[clang] [RFC] Add clang atomic control options and pragmas (PR #102569)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

Thank you for the patch, but RFCs for Clang should be published in https://discourse.llvm.org/c/clang/6. PRs doesn't have the visibility we want RFCs to have.

https://github.com/llvm/llvm-project/pull/102569