[llvm] [LLVM] Add support to define lit test suites with a smaller set of dependencies (PR #155929)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

OK but it still does not seem to be "Add support to define lit test suites with ..." but "Add LLVM lit test suites with ..."?

https://github.com/llvm/llvm-project/pull/155929