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

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

Can you precommit the tests in this PR so we can see the difference with the VPlanTransforms.cpp changes? In this case you would need to force push

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