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

[Ramkumar Ramachandra via llvm-commits]

================

----------------
artagnon wrote:

```suggestion
.Case<VPInstruction, VPWidenRecipe, VPWidenCastRecipe, VPWidenGEPRecipe,
VPReplicateRecipe, VPWidenPHIRecipe, VPWidenLoadRecipe>(
[](auto *I) { return I->getOpcode(); })
```

could add getOpcode to VPWidenLoadRecipe?

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