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/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 61ff611..7e3c343 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -1291,7 +1291,8 @@
   case BuiltinType::UInt128:
   case BuiltinType::Char_S:
   case BuiltinType::SChar:
-  case BuiltinType::WChar:
+  case BuiltinType::WChar_U:
+  case BuiltinType::WChar_S:
   case BuiltinType::Short:
   case BuiltinType::Int:
   case BuiltinType::Long: