[llvm] [LV] Support partial reduce subs/fsubs without a mul operand (PR #199664)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/VPlan.h llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index 9257c8c58..374ef73ce 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -6255,8 +6255,8 @@ createPartialReductionExpression(VPReductionRecipe *Red) {
   // -> VPExpressionRecipe(op, sub/neg, red)
   if (match(VecOp, m_AnyNeg(m_WidenAnyExtend(m_VPValue())))) {
     auto *Neg = cast<VPWidenRecipe>(VecOp);
-    auto *Ext = cast<VPWidenCastRecipe>(
-        Neg->getOperand(Neg->getNumOperands() - 1));
+    auto *Ext =
+        cast<VPWidenCastRecipe>(Neg->getOperand(Neg->getNumOperands() - 1));
     return new VPExpressionRecipe(Ext, Neg, Red);
   }
 

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https://github.com/llvm/llvm-project/pull/199664