[PATCH] D142604: [Clang] Fix __VA_OPT__ implementation so that it treats the concatenation of a non-placemaker token and placemaker token as a non-placemaker token

[Louis Dionne via Phabricator via cfe-commits]

ldionne added a comment.

I suspect the libc++ failure is because the patch is not rebased onto `main`. I remember seeing those issues a while back. I think it's unlikely to be this patch.


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https://reviews.llvm.org/D142604