Better support for constructors with -cxx-abi microsoft, partly fixes PR12784

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176186 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCXX.cpp b/lib/CodeGen/CGCXX.cpp
index 43813fe..983cb92 100644
--- a/lib/CodeGen/CGCXX.cpp
+++ b/lib/CodeGen/CGCXX.cpp
@@ -183,14 +183,16 @@
 
   // The constructor used for constructing this as a base class;
   // ignores virtual bases.
-  EmitGlobal(GlobalDecl(D, Ctor_Base));
+  if (getTarget().getCXXABI().hasConstructorVariants())
+    EmitGlobal(GlobalDecl(D, Ctor_Base));
 }
 
 void CodeGenModule::EmitCXXConstructor(const CXXConstructorDecl *ctor,
                                        CXXCtorType ctorType) {
   // The complete constructor is equivalent to the base constructor
   // for classes with no virtual bases.  Try to emit it as an alias.
-  if (ctorType == Ctor_Complete &&
+  if (getTarget().getCXXABI().hasConstructorVariants() &&
+      ctorType == Ctor_Complete &&
       !ctor->getParent()->getNumVBases() &&
       !TryEmitDefinitionAsAlias(GlobalDecl(ctor, Ctor_Complete),
                                 GlobalDecl(ctor, Ctor_Base)))