[llvm] [SLP] Compute a shuffle mask for SK_Broadcast shuffle (PR #85327)

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``````````bash
git-clang-format --diff 33960c90258ed78b9b877b1a43e219d1cbc2efce 6734e37e873263eecd9b2f871f1c4a0cbda85f06 -- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 885015df1f..25962abb03 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -7750,16 +7750,15 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
                                       PoisonValue::get(VecTy), *It);
 
       SmallVector<int> ShuffleMask(VL.size(), -1);
-      transform(VL, ShuffleMask.begin(), [](Value *V) {
-        return !isa<UndefValue>(V);
-      });
-      InstructionCost InsertCost = TTI.getVectorInstrCost(
-          Instruction::InsertElement, VecTy, CostKind, 0,
-          PoisonValue::get(VecTy), *It);
-      return InsertCost +
-             TTI.getShuffleCost(TargetTransformInfo::SK_Broadcast, VecTy,
-                                ShuffleMask, CostKind, /*Index=*/0,
-                                /*SubTp=*/nullptr, /*Args=*/*It);
+      transform(VL, ShuffleMask.begin(),
+                [](Value *V) { return !isa<UndefValue>(V); });
+      InstructionCost InsertCost =
+          TTI.getVectorInstrCost(Instruction::InsertElement, VecTy, CostKind, 0,
+                                 PoisonValue::get(VecTy), *It);
+      return InsertCost + TTI.getShuffleCost(TargetTransformInfo::SK_Broadcast,
+                                             VecTy, ShuffleMask, CostKind,
+                                             /*Index=*/0,
+                                             /*SubTp=*/nullptr, /*Args=*/*It);
     }
     return GatherCost +
            (all_of(Gathers, UndefValue::classof)

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https://github.com/llvm/llvm-project/pull/85327