[Support] fix compile with -Werror

error: commas at the end of enumerator lists are a C++11 extension
[-Werror,-Wc++11-extensions]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189183 91177308-0d34-0410-b5e6-96231b3b80d8