Improved MSVC __interface support by adding first class support for it, instead of aliasing to "struct" which had some incorrect behaviour. Patch by David Robins.

llvm-svn: 163013
diff --git a/clang/lib/Sema/SemaTemplateVariadic.cpp b/clang/lib/Sema/SemaTemplateVariadic.cpp
index aece90b..6147d63 100644
--- a/clang/lib/Sema/SemaTemplateVariadic.cpp
+++ b/clang/lib/Sema/SemaTemplateVariadic.cpp
@@ -727,6 +727,7 @@
   case TST_enum:
   case TST_union:
   case TST_struct:
+  case TST_interface:
   case TST_class:
   case TST_auto:
   case TST_unknown_anytype: