The -fshort-wchar option causes wchar_t to become unsigned, in addition to being
16-bits in size.  Implement this by splitting WChar into two enums, like we have
for char.  This fixes a miscompmilation of XULRunner, PR8856.

llvm-svn: 122558
diff --git a/clang/lib/CodeGen/CGRTTI.cpp b/clang/lib/CodeGen/CGRTTI.cpp
index a8893d1..444062b 100644
--- a/clang/lib/CodeGen/CGRTTI.cpp
+++ b/clang/lib/CodeGen/CGRTTI.cpp
@@ -196,7 +196,8 @@
     case BuiltinType::Void:
     case BuiltinType::NullPtr:
     case BuiltinType::Bool:
-    case BuiltinType::WChar:
+    case BuiltinType::WChar_S:
+    case BuiltinType::WChar_U:
     case BuiltinType::Char_U:
     case BuiltinType::Char_S:
     case BuiltinType::UChar: