[llvm] [VPlan][LV] Add removeRedundantAndMasks to VPlanTransforms (PR #163534)

[Nashe Mncube via llvm-commits]

nasherm wrote:

> If you are specifically targeting post-vectorization here, is it possible to do this as a VPlan simplification instead?
Yes! Sorry for the delay. It took me a while to get up to speed with VPlan. I've ported over my original pass logic into VPlanTransforms

https://github.com/llvm/llvm-project/pull/163534