Centralize the handling of the "attribute declaration must precede definition"
warning. This also makes us warn on tags, which, ironically, is the only case
gcc warns on.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157039 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed