[llvm] [LLVM] Exclude specialized lit test suites from check-all (PR #159781)

[Aiden Grossman via llvm-commits]

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

LGTM. Can we please land this or revert the original patch quickly to get the bots back to green?

https://github.com/llvm/llvm-project/pull/159781