Allow disabling of wchar_t type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163221 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 53bbfa4..8089a0a 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -391,6 +391,8 @@
   HelpText<"Main file name to use for debug info">;
 def fno_signed_char : Flag<"-fno-signed-char">,
   HelpText<"Char is unsigned">;
+def fno_wchar : Flag<"-fno-wchar">,
+  HelpText<"Disable C++ builtin type wchar_t">;
 def fconstant_string_class : Separate<"-fconstant-string-class">,
   MetaVarName<"<class name>">,
   HelpText<"Specify the class to use for constant Objective-C string objects.">;