[llvm] [VPlan] Remove non-reductions after simplifications. (PR #176795)

[via llvm-commits]

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@@ -127,6 +127,7 @@ bool VPRecipeBase::mayReadFromMemory() const {
   case VPBranchOnMaskSC:
   case VPDerivedIVSC:
   case VPFirstOrderRecurrencePHISC:
+  case VPReductionPHISC:
   case VPPredInstPHISC:
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ayalz wrote:

```suggestion
  case VPPredInstPHISC:
  case VPReductionPHISC:
```
lex order

https://github.com/llvm/llvm-project/pull/176795