[PATCH] D61858: Make `__is_base_of` more friendly with unions

[Louis Dionne via Phabricator via cfe-commits]

ldionne accepted this revision.
ldionne added a comment.
This revision is now accepted and ready to land.

I'm not a frontend expert, but this looks reasonable to me.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D61858/new/

https://reviews.llvm.org/D61858