[clang] Revert "[Clang] Fix atomic boolean compound assignment (#33210)" (PR #180183)

[Jonathan Thackray via cfe-commits]

https://github.com/jthackray approved this pull request.

Hi Kiran, you normally don't need to wait for someone to approve a revert, if you've done the revert from the GitHub UI. LGTM.

https://github.com/llvm/llvm-project/pull/180183