[llvm] [DAG] Scalarise trivial splat operations (PR #226257)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
index 73bf5aaf2..2e6190b30 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
@@ -64,7 +64,9 @@ void DAGTypeLegalizer::ScalarizeVectorResult(SDNode *N, unsigned ResNo) {
   case ISD::MERGE_VALUES:      R = ScalarizeVecRes_MERGE_VALUES(N, ResNo);break;
   case ISD::BITCAST:           R = ScalarizeVecRes_BITCAST(N); break;
   case ISD::SPLAT_VECTOR:
-  case ISD::BUILD_VECTOR:      R = ScalarizeVecRes_BUILD_VECTOR_OR_SPLAT(N); break;
+  case ISD::BUILD_VECTOR:
+    R = ScalarizeVecRes_BUILD_VECTOR_OR_SPLAT(N);
+    break;
   case ISD::EXTRACT_SUBVECTOR: R = ScalarizeVecRes_EXTRACT_SUBVECTOR(N); break;
   case ISD::FP_ROUND:          R = ScalarizeVecRes_FP_ROUND(N); break;
   case ISD::CONVERT_FROM_ARBITRARY_FP:

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https://github.com/llvm/llvm-project/pull/226257