Refine codegen for covariant thunks that return references.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85916 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index 65ed767..3608d34 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -224,6 +224,8 @@
     return OPT->getPointeeType();
   if (const BlockPointerType *BPT = getAs<BlockPointerType>())
     return BPT->getPointeeType();
+  if (const ReferenceType *RT = getAs<ReferenceType>())
+    return RT->getPointeeType();
   return QualType();
 }