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

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers approved this pull request.

Another failure overnight: https://lab.llvm.org/buildbot/#/builders/171/builds/11699/steps/4/logs/stdio

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