[llvm] [VPlan] Add ReductionStartVector VPInstruction. (PR #142290)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanAnalysis.cpp llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
index 3a48feb8c..fb43aaab7 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanUnroll.cpp
@@ -223,7 +223,10 @@ void UnrollState::unrollHeaderPHIByUF(VPHeaderPHIRecipe *R,
       Copy->addOperand(R);
       Copy->addOperand(getConstantVPV(Part));
     } else if (RdxPhi) {
-      // If the start value is a ReductionStartVector, use the identity value (second operand) for unrolled parts. If the scaling factor is > 1, create a new ReductionStartVector with the scale factor and both operands set to the identity value.
+      // If the start value is a ReductionStartVector, use the identity value
+      // (second operand) for unrolled parts. If the scaling factor is > 1,
+      // create a new ReductionStartVector with the scale factor and both
+      // operands set to the identity value.
       if (auto *VPI = dyn_cast<VPInstruction>(RdxPhi->getStartValue())) {
         if (cast<ConstantInt>(VPI->getOperand(2)->getLiveInIRValue())
                 ->getZExtValue() == 1)

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https://github.com/llvm/llvm-project/pull/142290