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

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Transforms/Vectorize/LoopVectorizationPlanner.h llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
index ba3d8ed86..a1b6440a6 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
@@ -126,7 +126,8 @@ public:
 };
 } // namespace
 
-void UnrollState::addStartIndexForScalarSteps(VPScalarIVStepsRecipe *Steps, unsigned Part) {
+void UnrollState::addStartIndexForScalarSteps(VPScalarIVStepsRecipe *Steps,
+                                              unsigned Part) {
   if (Part == 0) {
     Steps->addOperand(getConstantInt(Part));
     return;

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