[llvm] [VPlan] Move FOR splice cost into VPInstruction::FirstOrderRecurrenceSplice (PR #129645)

[Luke Lau via llvm-commits]

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@@ -754,6 +754,17 @@ InstructionCost VPInstruction::computeCost(ElementCount VF,
     return Cost + Ctx.TTI.getVectorInstrCost(Instruction::ExtractElement, VecTy,
                                              Ctx.CostKind);
   }
+  case VPInstruction::FirstOrderRecurrenceSplice: {
+    assert(VF.isVector() && "Scalar FirstOrderRecurrenceSplice?");
+    SmallVector<int> Mask(VF.getKnownMinValue());
+    std::iota(Mask.begin(), Mask.end(), VF.getKnownMinValue() - 1);
+    Type *VectorTy =
+        toVectorTy(Ctx.Types.inferScalarType(this->getVPSingleValue()), VF);
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lukel97 wrote:

Looks like it's not, I've removed it

https://github.com/llvm/llvm-project/pull/129645