[libc-commits] [libc] [libc] revert all process_mrelease changes (PR #118650)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

@moar55 instead of stacking more fixes, let's just revert the changes. If you have time, could you resubmit this patch and removing all tests but the one testing the invalid argument? As @lntue said, we should not test syscall's correctness in libc's unittests.

https://github.com/llvm/llvm-project/pull/118650