[llvm] [VPlan] Replace ExtractLast(Elem|LanePerPart) with ExtractLast(Lane/Part) (PR #164124)

[Florian Hahn via llvm-commits]

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@@ -116,14 +116,18 @@ Type *VPTypeAnalysis::inferScalarTypeForRecipe(const VPInstruction *R) {
     return inferScalarType(R->getOperand(1));
   case VPInstruction::FirstActiveLane:
     return Type::getIntNTy(Ctx, 64);
-  case VPInstruction::ExtractLastElement:
-  case VPInstruction::ExtractLastLanePerPart:
+  case VPInstruction::ExtractLastLane:
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fhahn wrote:

`inferScalarType` will always infer a scalar type, so the code below casting to vector type is a no-op.

https://github.com/llvm/llvm-project/pull/164124