[llvm] [InstCombine] Improve coverage of `foldSelectValueEquivalence` (PR #88298)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Can you copy the commit message into the PR description? I know you always merge your patchs locally. But it may be more convenient for me to review :)




https://github.com/llvm/llvm-project/pull/88298