[llvm] [AMDGPU][NFC] Pre-commit test for redundant s_cmp_lg_* sX, 0 removal (PR #162351)

[via llvm-commits]

LU-JOHN wrote:

Deleting redundant s_cmp_lg* instruction done in https://github.com/llvm/llvm-project/pull/162352.

https://github.com/llvm/llvm-project/pull/162351