Fix a bug where we would incorrectly emit a "cannot paste" error 
message when handling the GNU ", ## __VA_ARGS__" extension.  While
I'm at it, flag uses of this as extensions.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46503 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed