[llvm] [SLP] Reject 2-element vectorization when vector inst count exceeds scalar (PR #190414)

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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 64ab2228f..b0c95fae7 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -12880,8 +12880,7 @@ unsigned BoUpSLP::getNumVectorInsts() const {
                 getSameValuesTreeEntry(TE.getMainOp(), TE.Scalars);
             E && E->getVectorFactor() == TE.getVectorFactor())
           continue;
-        SmallVector<Value *> RevScalars(TE.Scalars.rbegin(),
-                                       TE.Scalars.rend());
+        SmallVector<Value *> RevScalars(TE.Scalars.rbegin(), TE.Scalars.rend());
         if (const TreeEntry *E =
                 getSameValuesTreeEntry(TE.getMainOp(), RevScalars);
             E && E->getVectorFactor() == TE.getVectorFactor()) {

``````````

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https://github.com/llvm/llvm-project/pull/190414