simplify some other code for __extension__ processing.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57807 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
index e30e4f4..a347bf1 100644
--- a/lib/Parse/Parser.cpp
+++ b/lib/Parse/Parser.cpp
@@ -344,6 +344,7 @@
   case tok::kw___extension__: {
     // __extension__ silences extension warnings in the subexpression.
     ExtensionRAIIObject O(Diags);  // Use RAII to do this.
+    ConsumeToken();
     return ParseExternalDeclaration();
   }
   case tok::kw_asm: {