Comment parsing: attach any tag type's documentation to its typedef if latter
does not have one of its own. // rdar://13067629

Original patch (r173586 and r173587) by Fariborz Jahanian, modified by me.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173626 91177308-0d34-0410-b5e6-96231b3b80d8