[libc-commits] [libc] [libc] Add Darwin mutex support via os_sync primitives (PR #167722)

[Shreeyash Pandey via libc-commits]

bojle wrote:

@SchrodingerZhu added a link to the [issue](https://github.com/llvm/llvm-project/issues/172302) as a TODO

https://github.com/llvm/llvm-project/pull/167722