[clang] [Clang] [Sema] _Atomic along with restrict is considered an error (PR #202955)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

This will also need a release note, assuming @AaronBallman likes the changes.

https://github.com/llvm/llvm-project/pull/202955