[llvm] [LV] Remove common extends and selects in CSE (PR #147731)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Is the motivation for the change just removing redundant instructions in tests or unoptimized input IR?

Would be good to better understand the motivation for extending the legacy CSE, which originally was only intended to clean up some instructions related to inductions.

https://github.com/llvm/llvm-project/pull/147731