[llvm] [VPlan] Replace UnrollPart for VPScalarIVSteps with start index op (NFC) (PR #170906)

[via llvm-commits]

================
@@ -2492,8 +2492,6 @@ void VPScalarIVStepsRecipe::execute(VPTransformState &State) {
   // iteration.
   bool FirstLaneOnly = vputils::onlyFirstLaneUsed(this);
   // Compute the scalar steps and save the results in State.
-  Type *IntStepTy =
-      IntegerType::get(BaseIVTy->getContext(), BaseIVTy->getScalarSizeInBits());
 
   unsigned StartLane = 0;
   unsigned EndLane = FirstLaneOnly ? 1 : State.VF.getKnownMinValue();
----------------
ayalz wrote:

Note that VF is taken from State rather than from the 3rd operand.

https://github.com/llvm/llvm-project/pull/170906