Update to work with LLVM 2.7.

Removed use of dyn_cast, llvm no compiles
without exceptions and rtti by
default. We do need exceptions for the libconfig stuff, but rtti isn't
necessary (anymore).

Debug info needs to be rewritten, as in LLVM 2.7 the format has
completely changed. To have something to look at while rewriting, the
old code has been wrapped inside #ifndef DISABLE_DEBUG_INFO , this means
that you have to define this to compile at the moment.

Updated tango 0.99.9 patch to include updated EH runtime code, which is
needed for LLVM 2.7 as well.

gen/tollvm.cpp

@@ -157,7 +157,7 @@ const LLType* DtoType(Type* t)
         return getVoidPtrType();
 
 /*
-    Not needed atm as VarDecls for tuples are rewritten as a string of 
+    Not needed atm as VarDecls for tuples are rewritten as a string of
     VarDecls for the fields (u -> _u_field_0, ...)
 
     case Ttuple:
@@ -289,12 +289,12 @@ LLGlobalValue::LinkageTypes DtoLinkage(Dsymbol* sym)
     {
         assert(0 && "not global/function");
     }
-    
+
     // The following breaks for nested naked functions and other declarations, so check for that.
     bool skipNestedCheck = !mustDefineSymbol(sym);
     if (FuncDeclaration* fd = sym->isFuncDeclaration())
         skipNestedCheck = (fd->naked != 0);
-    
+
     // Any symbol nested in a function can't be referenced directly from
     // outside that function, so we can give such symbols internal linkage.
     // This holds even if nested indirectly, such as member functions of
@@ -313,7 +313,7 @@ LLGlobalValue::LinkageTypes DtoLinkage(Dsymbol* sym)
             if (parent->isFuncDeclaration())
                 return llvm::GlobalValue::InternalLinkage;
         }
-    
+
     // default to external linkage
     return llvm::GlobalValue::ExternalLinkage;
 }
@@ -362,7 +362,7 @@ LLValue* DtoPointedType(LLValue* ptr, LLValue* val)
         return val;
     }
     // ptr is integer pointer
-    else if (ptrTy->isInteger())
+    else if (ptrTy->isIntegerTy())
     {
         // val is integer
         assert(valTy->isInteger());