[llvm] [SLP]Emit loop-carried horizontal reductions as loop vector accumulator (PR #221598)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index ee8d26d21..a5f5709c7 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -33384,8 +33384,8 @@ bool SLPVectorizerPass::vectorizeHorReduction(
     HorizontalReduction HorRdx;
     Value *Res = nullptr;
     if (HorRdx.matchAssociativeReduction(R, Inst, *SE, *DT, *DL, *TTI, *TLI)) {
-      Value *Red = HorRdx.tryToReduce(R, *DL, TTI, *TLI, AC, *DT, *LI,
-                                      IsSeedRoot);
+      Value *Red =
+          HorRdx.tryToReduce(R, *DL, TTI, *TLI, AC, *DT, *LI, IsSeedRoot);
       // The chain with the flattened fsub/fneg links produced no vector part:
       // retry with the fsub/fneg links as leaves, they may be vectorizable on
       // their own.

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https://github.com/llvm/llvm-project/pull/221598