[PATCH] D45470: Emit an error when mixing <stdatomic.h> and <atomic>

[Volodymyr Sapsai via Phabricator via cfe-commits]

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

`__ALLOW_STDC_ATOMICS_IN_CXX__` approach didn't work in practice, I've reverted all changes.


Repository:
  rC Clang

https://reviews.llvm.org/D45470