[llvm] [LV] Account for vp_merge in out of loop EVL reductions in legacy cost model (PR #115903)

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git-clang-format --diff f9125ddc1faafaceac9064e889cd9b4a77523677 577290a0b4cbace14fa2aff0dae28a78b9835eae --extensions cpp -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 5c3afbe521..d029997e95 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -6567,8 +6567,8 @@ LoopVectorizationCostModel::getInstructionCost(Instruction *I,
                  CmpInst::BAD_ICMP_PREDICATE, CostKind);
     }
 
-    // When tail folding with EVL, if the phi is part of an out of loop reduction
-    // then it will be transformed into a wide vp_merge.
+    // When tail folding with EVL, if the phi is part of an out of loop
+    // reduction then it will be transformed into a wide vp_merge.
     if (VF.isVector() && foldTailWithEVL() &&
         Legal->getReductionVars().contains(Phi) && !isInLoopReduction(Phi)) {
       IntrinsicCostAttributes ICA(

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https://github.com/llvm/llvm-project/pull/115903