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

[Florian Hahn via llvm-commits]

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fhahn wrote:

### 
```suggestion
    // Compare the separately stored consecutive/masked flags. Alignment is left
    // out and different alignments are handled by cse.
```

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