r351316 - Reapply [Tooling] Make clang-tool find libc++ dir on mac when running on a file without compilation database.

[Jeremy Morse via cfe-commits]

We do rather need this working for our downstream merging to continue, and
to clear up the buildbots -- without objection I'll drop the  "REQUIRES:
system-darwin" line in there. Depending on what's actually supposed to be
tested that might be sufficient, but please do follow up.

--
Thanks,
Jeremy


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