[PATCH] CodeGen: implement __emit intrinsic

[David Majnemer]

================
Comment at: lib/Basic/Builtins.cpp:58-61
@@ -57,4 +57,6 @@
                             (BuiltinInfo.builtin_lang & GNU_LANG);
   bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
                            (BuiltinInfo.builtin_lang & MS_LANG);
+  bool MSCompatUnsupported = !LangOpts.MSVCCompat &&
+                             (BuiltinInfo.builtin_lang & MS_MODE);
   bool ObjCUnsupported = !LangOpts.ObjC1 &&
----------------
`MSModeUnsupported` uses `MS_LANG` and `MSCompatUnsupported` uses `MS_MODE`.  That's a little confusing.

http://reviews.llvm.org/D3489