[libc-commits] [libc] [libc] Establish clean baseline for implementation-in-namespace (PR #231639)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM, this gets us to a point where the checks that are running pass so that we can turn the checks on in CI, then we can start re-enabling the checks once they're ready.

https://github.com/llvm/llvm-project/pull/231639