diff --git a/dmd2/func.c b/dmd2/func.c
index 7a9dc42e..81121c65 100644
--- a/dmd2/func.c
+++ b/dmd2/func.c
@@ -105,25 +105,6 @@ FuncDeclaration::FuncDeclaration(Loc loc, Loc endloc, Identifier *id, StorageCla
     allowInlining = false;
     neverInline = false;
     availableExternally = true; // assume this unless proven otherwise
-
-    // function types in ldc don't merge if the context parameter differs
-    // so we actually don't care about the function declaration, but only
-    // what kind of context parameter it has.
-    // however, this constructor is usually called from the parser, which
-    // unfortunately doesn't provide the information needed to get to the
-    // aggregate type. So we have to stick with the FuncDeclaration and
-    // just be sure we don't actually rely on the symbol it points to,
-    // but rather just the type of its context parameter.
-    // this means some function might have a function type pointing to
-    // another function declaration
-
-    if (type)
-    {
-        assert(type->ty == Tfunction && "invalid function type");
-        TypeFunction* tf = (TypeFunction*)type;
-        if (tf->funcdecl == NULL)
-            tf->funcdecl = this;
-    }
 #endif
 }
 
diff --git a/dmd2/mangle.c b/dmd2/mangle.c
index 03b1849f..4d876ed8 100644
--- a/dmd2/mangle.c
+++ b/dmd2/mangle.c
@@ -87,11 +87,7 @@ L1:
         tfn.isref       = fd->storage_class & STCauto ? false : tfo->isref;
         tfn.trust       = tfo->trust;
         tfn.next        = NULL;     // do not mangle return type
-#if IN_LLVM
-        tfn.toDecoBuffer(&buf, 0, true);
-#else
         tfn.toDecoBuffer(&buf, 0);
-#endif
     }
     else if (sthis->type->deco)
         buf.writestring(sthis->type->deco);
diff --git a/dmd2/mtype.c b/dmd2/mtype.c
index 1baaa9b0..c7f7623a 100644
--- a/dmd2/mtype.c
+++ b/dmd2/mtype.c
@@ -135,10 +135,6 @@ unsigned char Type::mangleChar[TMAX];
 unsigned short Type::sizeTy[TMAX];
 StringTable Type::stringtable;
 
-#if IN_LLVM
-StringTable Type::deco_stringtable;
-#endif
-
 
 Type::Type(TY ty)
 {
@@ -208,9 +204,6 @@ void Type::init()
 #endif
 {
     stringtable._init(1543);
-#if IN_LLVM
-    deco_stringtable._init();
-#endif
     Lexer::initKeywords();
 
     for (size_t i = 0; i < TMAX; i++)
@@ -1537,7 +1530,7 @@ char *MODtoChars(unsigned char mod)
  *      flag    0x100   do not do const/invariant
  */
 
-void Type::toDecoBuffer(OutBuffer *buf, int flag, bool mangle) // Possible conflict from merge
+void Type::toDecoBuffer(OutBuffer *buf, int flag)
 {
     if (flag != mod && flag != 0x100)
     {
@@ -1651,7 +1644,7 @@ Type *Type::merge()
 
         //if (next)
             //next = next->merge();
-        toDecoBuffer(&buf, 0, false);
+        toDecoBuffer(&buf, 0);
         sv = stringtable.update((char *)buf.data, buf.offset);
         if (sv->ptrvalue)
         {   t = (Type *) sv->ptrvalue;
@@ -1665,28 +1658,7 @@ Type *Type::merge()
         else
         {
             sv->ptrvalue = this;
-
-#if IN_LLVM
-            // we still need deco strings to be unique
-            // or Type::equals fails, which breaks a bunch of stuff,
-            // like covariant member function overloads.
-            // TODO: Check if and why this is still needed.
-            OutBuffer mangle;
-            toDecoBuffer(&mangle, 0, true);
-            StringValue* sv2 = deco_stringtable.update((char *)mangle.data, mangle.offset);
-            if (sv2->ptrvalue)
-            {  Type* t2 = (Type *) sv2->ptrvalue;
-                assert(t2->deco);
-                deco = t2->deco;
-            }
-            else
-            {
-                sv2->ptrvalue = this;
-                deco = (char *)sv2->toDchars();
-            }
-#else
             deco = (char *)sv->toDchars();
-#endif
             //printf("new value, deco = '%s' %p\n", t->deco, t->deco);
         }
     }
@@ -1705,7 +1677,7 @@ Type *Type::merge2()
     if (!t->deco)
         return t->merge();
 
-    StringValue *sv = deco_stringtable.lookup((char *)t->deco, strlen(t->deco));
+    StringValue *sv = stringtable.lookup((char *)t->deco, strlen(t->deco));
     if (sv && sv->ptrvalue)
     {   t = (Type *) sv->ptrvalue;
         assert(t->deco);
@@ -2243,7 +2215,7 @@ Identifier *Type::getTypeInfoIdent(int internal)
             buf.writeByte(mangleChar[((TypeArray *)this)->next->ty]);
     }
     else
-       toDecoBuffer(&buf, 0, true);
+       toDecoBuffer(&buf, 0);
 
     size_t len = buf.offset;
     buf.writeByte(0);
@@ -2398,12 +2370,12 @@ TypeNext::TypeNext(TY ty, Type *next)
     this->next = next;
 }
 
-void TypeNext::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeNext::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     assert(next != this);
     //printf("this = %p, ty = %d, next = %p, ty = %d\n", this, this->ty, next, next->ty);
-    next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod, mangle);
+    next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod);
 }
 
 void TypeNext::checkDeprecated(Loc loc, Scope *sc)
@@ -3515,14 +3487,14 @@ void TypeVector::toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod)
     buf->writestring(")");
 }
 
-void TypeVector::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeVector::toDecoBuffer(OutBuffer *buf, int flag)
 {
     if (flag != mod && flag != 0x100)
     {
         MODtoDecoBuffer(buf, mod);
     }
     buf->writestring("Nh");
-    basetype->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod, mangle);
+    basetype->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod);
 }
 
 d_uns64 TypeVector::size(Loc loc)
@@ -4083,9 +4055,9 @@ Lerror:
     return Type::terror;
 }
 
-void TypeSArray::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeSArray::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     if (dim)
         buf->printf("%llu", dim->toInteger());
     if (next)
@@ -4094,7 +4066,7 @@ void TypeSArray::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
          * level, since for T[4][3], any const should apply to the T,
          * not the [4].
          */
-        next->toDecoBuffer(buf,  (flag & 0x100) ? flag : mod, mangle);
+        next->toDecoBuffer(buf,  (flag & 0x100) ? flag : mod);
 }
 
 void TypeSArray::toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod)
@@ -4387,11 +4359,11 @@ void TypeDArray::resolve(Loc loc, Scope *sc, Expression **pe, Type **pt, Dsymbol
     }
 }
 
-void TypeDArray::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeDArray::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     if (next)
-        next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod, mangle);
+        next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod);
 }
 
 void TypeDArray::toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod)
@@ -4753,11 +4725,11 @@ Expression *TypeAArray::dotExp(Scope *sc, Expression *e, Identifier *ident, int
     return e;
 }
 
-void TypeAArray::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeAArray::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
-    index->toDecoBuffer(buf, 0, mangle);
-    next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod, mangle);
+    Type::toDecoBuffer(buf, flag);
+    index->toDecoBuffer(buf, 0);
+    next->toDecoBuffer(buf, (flag & 0x100) ? 0 : mod);
 }
 
 void TypeAArray::toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod)
@@ -5144,9 +5116,6 @@ TypeFunction::TypeFunction(Parameters *parameters, Type *treturn, int varargs, e
     this->iswild = false;
     this->fargs = NULL;
 
-#if IN_LLVM
-    this->funcdecl = NULL;
-#endif
     if (stc & STCpure)
         this->purity = PUREfwdref;
     if (stc & STCnothrow)
@@ -5374,7 +5343,7 @@ Lnotcovariant:
     return 2;
 }
 
-void TypeFunction::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeFunction::toDecoBuffer(OutBuffer *buf, int flag)
 {   unsigned char mc;
 
     //printf("TypeFunction::toDecoBuffer() this = %p %s\n", this, toChars());
@@ -5422,53 +5391,12 @@ void TypeFunction::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
         }
     }
 
-#if IN_LLVM
-    // if we're not producing a mangle string, add the this
-    // type to prevent merging different member function
-    if (!mangle && funcdecl)
-    {
-        if (funcdecl->needThis())
-        {
-            AggregateDeclaration* ad = funcdecl->isMember2();
-            buf->writeByte('M');
-            ad->type->toDecoBuffer(buf, 0, false);
-        }
-        if (FuncLiteralDeclaration *literal = funcdecl->isFuncLiteralDeclaration()) {
-            // Never merge types of function literals of different kind
-            if (literal->tok == TOKdelegate) {
-                buf->writeByte('D');
-            } else if (literal->tok == TOKfunction) {
-                buf->writeByte('F');
-            } else if (literal->tok == TOKreserved) {
-                static int counter = 0;
-                buf->writeByte('L');
-                // And never merge types of lambdas, because we don't know whether
-                // they need a nested context argument or not.
-                buf->printf("%i", counter++);
-            }
-        }
-        /* BUG This causes problems with delegate types
-           On the other hand, the llvm type for nested functions *is* different
-           so not doing anything here may be lead to bugs!
-           A sane solution would be DtoType(Dsymbol)...
-        if (funcdecl->isNested())
-        {
-            buf->writeByte('M');
-            if (funcdecl->toParent2() && funcdecl->toParent2()->isFuncDeclaration())
-            {
-                FuncDeclaration* fd = funcdecl->toParent2()->isFuncDeclaration();
-                fd->type->toDecoBuffer(buf, 0, false);
-            }
-        }*/
-    }
-#endif
-
     // Write argument types
-    Parameter::argsToDecoBuffer(buf, parameters, mangle);
+    Parameter::argsToDecoBuffer(buf, parameters);
     //if (buf->data[buf->offset - 1] == '@') halt();
     buf->writeByte('Z' - varargs);      // mark end of arg list
     if(next != NULL)
-        next->toDecoBuffer(buf, 0, mangle);
+        next->toDecoBuffer(buf, 0);
     inuse--;
 }
 
@@ -6345,10 +6273,6 @@ Type *TypeFunction::addStorageClass(StorageClass stc)
         if (stc & STCsafe)
             tf->trust = TRUSTsafe;
 
-#if IN_LLVM
-        tf->funcdecl = t->funcdecl;
-#endif
-
         tf->deco = tf->merge()->deco;
         t = tf;
     }
@@ -6780,9 +6704,9 @@ Type *TypeIdentifier::syntaxCopy()
     return t;
 }
 
-void TypeIdentifier::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeIdentifier::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     const char *name = ident->toChars();
     size_t len = strlen(name);
     buf->printf("%u%s", (unsigned)len, name);
@@ -7487,10 +7411,10 @@ Type *TypeEnum::toBasetype()
     return sym->memtype->toBasetype();
 }
 
-void TypeEnum::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeEnum::toDecoBuffer(OutBuffer *buf, int flag)
 {
     const char *name = sym->mangle();
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     buf->printf("%s", name);
 }
 
@@ -7730,9 +7654,9 @@ Dsymbol *TypeTypedef::toDsymbol(Scope *sc)
     return sym;
 }
 
-void TypeTypedef::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeTypedef::toDecoBuffer(OutBuffer *buf, int flag)
 {
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     const char *name = sym->mangle();
     buf->printf("%s", name);
 }
@@ -8031,11 +7955,11 @@ Dsymbol *TypeStruct::toDsymbol(Scope *sc)
     return sym;
 }
 
-void TypeStruct::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeStruct::toDecoBuffer(OutBuffer *buf, int flag)
 {
     const char *name = sym->mangle();
     //printf("TypeStruct::toDecoBuffer('%s') = '%s'\n", toChars(), name);
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     buf->printf("%s", name);
 }
 
@@ -8565,11 +8489,11 @@ Dsymbol *TypeClass::toDsymbol(Scope *sc)
     return sym;
 }
 
-void TypeClass::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeClass::toDecoBuffer(OutBuffer *buf, int flag)
 {
     const char *name = sym->mangle();
     //printf("TypeClass::toDecoBuffer('%s' flag=%d mod=%x) = '%s'\n", toChars(), flag, mod, name);
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     buf->printf("%s", name);
 }
 
@@ -9230,12 +9154,12 @@ void TypeTuple::toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod)
     Parameter::argsToCBuffer(buf, hgs, arguments, 0);
 }
 
-void TypeTuple::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
+void TypeTuple::toDecoBuffer(OutBuffer *buf, int flag)
 {
     //printf("TypeTuple::toDecoBuffer() this = %p, %s\n", this, toChars());
-    Type::toDecoBuffer(buf, flag, mangle);
+    Type::toDecoBuffer(buf, flag);
     OutBuffer buf2;
-    Parameter::argsToDecoBuffer(&buf2, arguments, mangle);
+    Parameter::argsToDecoBuffer(&buf2, arguments);
     int len = (int)buf2.offset;
     buf->printf("%d%.*s", len, len, (char *)buf2.extractData());
 }
@@ -9465,18 +9389,10 @@ int TypeNull::checkBoolean()
     return TRUE;
 }
 
-#if IN_LLVM
-void TypeNull::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
-#else
 void TypeNull::toDecoBuffer(OutBuffer *buf, int flag)
-#endif
 {
     //tvoidptr->toDecoBuffer(buf, flag);
-#if IN_LLVM
-    Type::toDecoBuffer(buf, flag, mangle);
-#else
     Type::toDecoBuffer(buf, flag);
-#endif
 }
 
 void TypeNull::toCBuffer(OutBuffer *buf, Identifier *ident, HdrGenState *hgs)
@@ -9602,31 +9518,15 @@ void Parameter::argsToCBuffer(OutBuffer *buf, HdrGenState *hgs, Parameters *argu
 
 static int argsToDecoBufferDg(void *ctx, size_t n, Parameter *arg)
 {
-#if IN_LLVM
-    arg->toDecoBuffer((OutBuffer *)ctx, false);
-#else
     arg->toDecoBuffer((OutBuffer *)ctx);
-#endif
     return 0;
 }
 
-#if IN_LLVM
-static int argsToDecoBufferDg2(void *ctx, size_t n, Parameter *arg)
-{
-    arg->toDecoBuffer((OutBuffer *)ctx, true);
-    return 0;
-}
-#endif
-
-void Parameter::argsToDecoBuffer(OutBuffer *buf, Parameters *arguments, bool mangle)
+void Parameter::argsToDecoBuffer(OutBuffer *buf, Parameters *arguments)
 {
     //printf("Parameter::argsToDecoBuffer()\n");
     // Write argument types
-#if IN_LLVM
-    foreach(arguments, mangle ? &argsToDecoBufferDg2 : &argsToDecoBufferDg, buf);
-#else
     foreach(arguments, &argsToDecoBufferDg, buf);
-#endif
 }
 
 /****************************************
@@ -9676,7 +9576,7 @@ Type *Parameter::isLazyArray()
     return NULL;
 }
 
-void Parameter::toDecoBuffer(OutBuffer *buf, bool mangle)
+void Parameter::toDecoBuffer(OutBuffer *buf)
 {
     if (storageClass & STCscope)
         buf->writeByte('M');
@@ -9707,7 +9607,7 @@ void Parameter::toDecoBuffer(OutBuffer *buf, bool mangle)
     type->toDecoBuffer(buf, mod);
 #else
     //type->toHeadMutable()->toDecoBuffer(buf, 0);
-    type->toDecoBuffer(buf, 0, mangle);
+    type->toDecoBuffer(buf, 0);
 #endif
 }
 
diff --git a/dmd2/mtype.h b/dmd2/mtype.h
index cfc583c1..5afd82c1 100644
--- a/dmd2/mtype.h
+++ b/dmd2/mtype.h
@@ -229,9 +229,6 @@ struct Type : Object
     static unsigned char mangleChar[TMAX];
     static unsigned short sizeTy[TMAX];
     static StringTable stringtable;
-#if IN_LLVM
-    static StringTable deco_stringtable;
-#endif
 
     // These tables are for implicit conversion of binary ops;
     // the indices are the type of operand one, followed by operand two.
@@ -263,7 +260,7 @@ struct Type : Object
     virtual Type *semantic(Loc loc, Scope *sc);
     Type *trySemantic(Loc loc, Scope *sc);
     // append the mangleof or a string uniquely identifying this type to buf
-    virtual void toDecoBuffer(OutBuffer *buf, int flag = 0, bool mangle=false);
+    virtual void toDecoBuffer(OutBuffer *buf, int flag = 0);
     Type *merge();
     Type *merge2();
     virtual void toCBuffer(OutBuffer *buf, Identifier *ident, HdrGenState *hgs);
@@ -400,7 +397,7 @@ struct TypeNext : Type
     Type *next;
 
     TypeNext(TY ty, Type *next);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void checkDeprecated(Loc loc, Scope *sc);
     Type *reliesOnTident(TemplateParameters *tparams = NULL);
     int hasWild();
@@ -468,11 +465,7 @@ struct TypeVector : Type
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
     char *toChars();
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
-#if IN_LLVM
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
-#else
     void toDecoBuffer(OutBuffer *buf, int flag);
-#endif
     void toJson(JsonOut *json);
     MATCH deduceType(Scope *sc, Type *tparam, TemplateParameters *parameters, Objects *dedtypes, unsigned *wildmatch = NULL);
 #if CPP_MANGLE
@@ -516,7 +509,7 @@ struct TypeSArray : TypeArray
     unsigned alignsize();
     Type *semantic(Loc loc, Scope *sc);
     void resolve(Loc loc, Scope *sc, Expression **pe, Type **pt, Dsymbol **ps);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -559,7 +552,7 @@ struct TypeDArray : TypeArray
     unsigned alignsize();
     Type *semantic(Loc loc, Scope *sc);
     void resolve(Loc loc, Scope *sc, Expression **pe, Type **pt, Dsymbol **ps);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -597,7 +590,7 @@ struct TypeAArray : TypeArray
     Type *semantic(Loc loc, Scope *sc);
     StructDeclaration *getImpl();
     void resolve(Loc loc, Scope *sc, Expression **pe, Type **pt, Dsymbol **ps);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -714,7 +707,7 @@ struct TypeFunction : TypeNext
     Type *syntaxCopy();
     Type *semantic(Loc loc, Scope *sc);
     void purityLevel();
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer(OutBuffer *buf, Identifier *ident, HdrGenState *hgs);
     void toCBufferWithAttributes(OutBuffer *buf, Identifier *ident, HdrGenState* hgs, TypeFunction *attrs, TemplateDeclaration *td);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
@@ -745,8 +738,6 @@ struct TypeFunction : TypeNext
 
 #if IN_LLVM
     IrFuncTy irFty;
-
-    FuncDeclaration* funcdecl;
 #endif
 };
 
@@ -809,7 +800,7 @@ struct TypeIdentifier : TypeQualified
     const char *kind();
     Type *syntaxCopy();
     //char *toChars();
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     void resolve(Loc loc, Scope *sc, Expression **pe, Type **pt, Dsymbol **ps);
@@ -892,7 +883,7 @@ struct TypeStruct : Type
     Type *syntaxCopy();
     Type *semantic(Loc loc, Scope *sc);
     Dsymbol *toDsymbol(Scope *sc);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -942,7 +933,7 @@ struct TypeEnum : Type
     char *toChars();
     Type *semantic(Loc loc, Scope *sc);
     Dsymbol *toDsymbol(Scope *sc);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -988,7 +979,7 @@ struct TypeTypedef : Type
     char *toChars();
     Type *semantic(Loc loc, Scope *sc);
     Dsymbol *toDsymbol(Scope *sc);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -1042,7 +1033,7 @@ struct TypeClass : Type
     Type *syntaxCopy();
     Type *semantic(Loc loc, Scope *sc);
     Dsymbol *toDsymbol(Scope *sc);
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
     void toJson(JsonOut *json);
     Expression *dotExp(Scope *sc, Expression *e, Identifier *ident, int flag);
@@ -1087,11 +1078,7 @@ struct TypeTuple : Type
     int equals(Object *o);
     Type *reliesOnTident(TemplateParameters *tparams = NULL);
     void toCBuffer2(OutBuffer *buf, HdrGenState *hgs, int mod);
-#if IN_LLVM
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
-#else
     void toDecoBuffer(OutBuffer *buf, int flag);
-#endif
     void toJson(JsonOut *json);
     Expression *getProperty(Loc loc, Identifier *ident, int flag);
     Expression *defaultInit(Loc loc);
@@ -1118,7 +1105,7 @@ struct TypeNull : Type
     const char *kind();
 
     Type *syntaxCopy();
-    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
+    void toDecoBuffer(OutBuffer *buf, int flag);
     MATCH implicitConvTo(Type *to);
     int checkBoolean();
 
@@ -1144,7 +1131,7 @@ struct Parameter : Object
     Parameter(StorageClass storageClass, Type *type, Identifier *ident, Expression *defaultArg);
     Parameter *syntaxCopy();
     Type *isLazyArray();
-    void toDecoBuffer(OutBuffer *buf, bool mangle);
+    void toDecoBuffer(OutBuffer *buf);
     int dyncast() { return DYNCAST_PARAMETER; } // kludge for template.isType()
     static Parameters *arraySyntaxCopy(Parameters *args);
     static char *argsTypesToChars(Parameters *args, int varargs);
@@ -1152,7 +1139,7 @@ struct Parameter : Object
     static void argsCppMangle(OutBuffer *buf, CppMangleState *cms, Parameters *arguments, int varargs);
 #endif
     static void argsToCBuffer(OutBuffer *buf, HdrGenState *hgs, Parameters *arguments, int varargs);
-    static void argsToDecoBuffer(OutBuffer *buf, Parameters *arguments, bool mangle);
+    static void argsToDecoBuffer(OutBuffer *buf, Parameters *arguments);
     static int isTPL(Parameters *arguments);
     static size_t dim(Parameters *arguments);
     static Parameter *getNth(Parameters *arguments, size_t nth, size_t *pn = NULL);