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/lib/Basic/IdentifierTable.cpp b/lib/Basic/IdentifierTable.cpp
index 4869ae1..082c768 100644
--- a/lib/Basic/IdentifierTable.cpp
+++ b/lib/Basic/IdentifierTable.cpp
@@ -105,6 +105,7 @@
     KEYC11 = 0x400,
     KEYARC = 0x800,
     KEYNOMS = 0x01000,
+    WCHARSUPPORT = 0x02000,
     KEYALL = (0xffff & ~KEYNOMS) // Because KEYNOMS is used to exclude.
   };
 }
@@ -129,6 +130,7 @@
   else if (LangOpts.MicrosoftExt && (Flags & KEYMS)) AddResult = 1;
   else if (LangOpts.Borland && (Flags & KEYBORLAND)) AddResult = 1;
   else if (LangOpts.Bool && (Flags & BOOLSUPPORT)) AddResult = 2;
+  else if (LangOpts.WChar && (Flags & WCHARSUPPORT)) AddResult = 2;
   else if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) AddResult = 2;
   else if (LangOpts.OpenCL && (Flags & KEYOPENCL)) AddResult = 2;
   else if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) AddResult = 2;