[llvm] [VPlan] Model FOR extract of exit value in VPlan. (PR #93395)

[Florian Hahn via llvm-commits]

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@@ -137,6 +137,7 @@ bool VPRecipeBase::mayHaveSideEffects() const {
     case VPInstruction::Not:
     case VPInstruction::CalculateTripCountMinusVF:
     case VPInstruction::CanonicalIVIncrementForPart:
+    case VPInstruction::ExtractFromEnd:
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fhahn wrote:

It is needed for the patch, as it always adds the extract and RAUW outside the loop, relying on DCE to clean up unneeded extracts.

https://github.com/llvm/llvm-project/pull/93395