A few fixes for 64bit

dmd2/func.c

@@ -977,6 +977,7 @@ void FuncDeclaration::semantic3(Scope *sc)
 #else
             Type *t;
 
+#if !IN_LLVM
             if (global.params.is64bit)
             {   // Declare save area for varargs registers
                 Type *t = new TypeIdentifier(loc, Id::va_argsave_t);
@@ -991,6 +992,7 @@ void FuncDeclaration::semantic3(Scope *sc)
                     v_argsave->parent = this;
                 }
             }
+#endif
 
             if (f->linkage == LINKd)
             {   // Declare _arguments[]