[llvm] [VPlan] Extend cse to eliminate redundant widened loads (PR #212543)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

Hm, curious why this can't be integrated into VPCSEDenseMapInfo? We can easily check for aliasing, similarly to how we handle memops in licm?

https://github.com/llvm/llvm-project/pull/212543