Don't attempt to parse both the old and new grammars. It is near impossible
to get it right. Remove support for the new define keyword and don't
attempt to insert parameter attributes because there isn't enough
contextual information for it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32784 91177308-0d34-0410-b5e6-96231b3b80d8