[llvm] [CVP] Implement type narrowing for LShr (PR #119577)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I don't think CVP should be doing this transform. This looks like the job of TruncInstCombine in AggressiveInstCombine?

https://github.com/llvm/llvm-project/pull/119577