[libc-commits] [libc] [libc] pipe(2) linux syscall wrapper and unittest (PR #85514)

[via libc-commits]

muffpy wrote:

@nickdesaulniers please ignore my old pull request ([85402](https://github.com/llvm/llvm-project/pull/85402)) and review this patch instead 🙂

https://github.com/llvm/llvm-project/pull/85514