[libcxx-commits] [libcxxabi] [libc++] Remove the CI job testing Clang 15 (PR #66406)

[Mark de Wever via libcxx-commits]

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

Thanks for this patch and the additional cleanups!

A small note regarding the motivation. Our documentation states we should do this cleanup post release and not after branching. Having Clang 15 tested in main during the release process gave me quite a bit of confidence patches proposed for backporting didn't cause issues with Clang 15 in the release branch.

Based on our current state I don't mind landing this a few days before the official release.

As a side note would now also be a good time to remove the libc++ 17 release notes from main.

https://github.com/llvm/llvm-project/pull/66406