[libc-commits] [libc] Add _exit() according to _Exit() implementation (PR #87184)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

@michaelrj-google and discussed briefly redoing our documentation on contributing.

https://libc.llvm.org/contributing.html

As is, it doesn't really discuss how to start contributing implementations adequately; as such we've been manually writing large blocks of advice on each issue filed on how/where to start. I suspect much of that text can be reused in our public documentation.

Basically, we need to start by adding entrypoints; the entire build system is keyed off entrypoints.  We'll work on refreshing our contributor docs.

https://github.com/llvm/llvm-project/pull/87184