[llvm] [NFC][LLVM-Tests] Specialize test suite for LLVM unit tests (PR #161442)

[Rahul Joshi via llvm-commits]

jurahul wrote:

It should not, so not intentional. I think these tests should still be a part of check-all atleast and check-llvm as well. Let me test a little bit to confirm tomorrow 

https://github.com/llvm/llvm-project/pull/161442