[clang-tools-extra] [clang] [llvm] Add out-of-line-atomics support to GlobalISel (PR #74588)

[Thomas Preud'homme via cfe-commits]

RoboTux wrote:

Thanks for fixing the unused variable @DamonFool , I was about to revert and push a new patch.

https://github.com/llvm/llvm-project/pull/74588