[llvm] [LV] Skip replicating already-scalar casts (PR #195646)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Is there any particular reason for doing this as new PR instead of updating the existing https://github.com/llvm/llvm-project/pull/140623/?

https://github.com/llvm/llvm-project/pull/195646