[libcxx-commits] [libcxx] [libc++] Add link to premerge tesing dashboard to docs. (PR #160342)

[Aiden Grossman via libcxx-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Someone from the libc++ side needs to review this as well though.

https://github.com/llvm/llvm-project/pull/160342