Handle WChar inside BuiltinType::getName().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54587 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index c4b44af..46e685b 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -665,6 +665,7 @@
   case Float:             return "float";
   case Double:            return "double";
   case LongDouble:        return "long double";
+  case WChar:             return "wchar_t";
   }
 }