Back out __decltype warning from r151377: we should either warn on all the GNU
__keywords or none of them.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151401 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index 5468700..d798281 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -653,8 +653,8 @@
       return EndLoc;
     }
   } else {
-    Diag(Tok, Tok.getIdentifierInfo()->isStr("decltype")
-           ? diag::warn_cxx98_compat_decltype : diag::ext_gnu_decltype);
+    if (Tok.getIdentifierInfo()->isStr("decltype"))
+      Diag(Tok, diag::warn_cxx98_compat_decltype);
 
     ConsumeToken();