[llvm] [SLP][Modularisation][NFC] Extract free cost helpers into SLPCostAnalysis (PR #210278)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.cpp llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h b/llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h
index 835294287..a3ae27e99 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCostAnalysis.h
@@ -31,8 +31,8 @@ class VectorType;
 namespace llvm::slpvectorizer {
 
 /// Returns the cost of the shuffle instructions with the given \p Kind, vector
-/// type \p Tp and optional \p Mask. Adds SLP-specific cost estimation for insert
-/// subvector pattern.
+/// type \p Tp and optional \p Mask. Adds SLP-specific cost estimation for
+/// insert subvector pattern.
 InstructionCost getShuffleCost(const TargetTransformInfo &TTI,
                                TargetTransformInfo::ShuffleKind Kind,
                                VectorType *Tp, ArrayRef<int> Mask = {},

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https://github.com/llvm/llvm-project/pull/210278