[libc-commits] [libc] [libc] Add `shm_open/shm_unlink` (PR #84974)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

@nickdesaulniers I think a portable way is to use https://github.com/llvm/llvm-project/issues/85121 for a POSIX function. It requires additional work out of the scope of `shm_open/shm_unlink`. I can work on that later on in a separate patch.

https://github.com/llvm/llvm-project/pull/84974