Make IrFuncTy a member of TypeFunction. Reset between modules compiled in the

same LDC call.

dmd/mtype.c

@@ -2659,9 +2659,6 @@ TypeFunction::TypeFunction(Arguments *parameters, Type *treturn, int varargs, en
     this->varargs = varargs;
     this->linkage = linkage;
     this->inuse = 0;
-
-    // LDC
-    this->fty = NULL;
 }
 
 Type *TypeFunction::syntaxCopy()

dmd/mtype.h

@@ -23,8 +23,8 @@
 
 // llvm
 #include "../ir/irtype.h"
+#include "../ir/irfuncty.h"
 namespace llvm { class Type; }
-struct IrFuncTy;
 
 struct Scope;
 struct Identifier;
@@ -437,7 +437,7 @@ struct TypeFunction : Type
     unsigned totym();
 
     // LDC
-    IrFuncTy* fty;
+    IrFuncTy fty;
 };
 
 struct TypeDelegate : Type