[llvm] [AMDGPU][NFC] Test autogenerated llc tests for COV5 (PR #74339)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

The change itself seems fine (though the new metadata spam is a bit annoying, and should eventually be removed).

The DAG vs. GlobalISel divergence in some of these cases is concerning and shouldn't be happening 

https://github.com/llvm/llvm-project/pull/74339