[llvm] [SLP] Pass operand info to getCmpSelInstrInfo (PR #109998)

[Philip Reames via llvm-commits]

preames wrote:

FYI, this is the same change as originally posted under https://github.com/llvm/llvm-project/commit/d2885743630fcb35fdf64d21bd4bec62a5cb4d37 before it was requested to be split.  I looked at the other call sites in SLP, and couldn't easily identify how to test them.  I'd like to move forward with only these.  

https://github.com/llvm/llvm-project/pull/109998