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

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

```suggestion
          auto Loc = vputils::getMemoryLocation(*EarlierLoad);
          if (!canCSEWithNoAliasCheck(*Loc, EarlierLoad, Def))
```

unnecessary cast? Takes a VPRecipeBase anyway?

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