[llvm] [VPlanTransform] Rename and narrow simplifyRecipe to VPSingleDefRecipe. nfc (PR #165568)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index 6d2701138..d5d3c64a6 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -1264,7 +1264,7 @@ static void simplifyRecipe(VPSingleDefRecipe *Def, VPTypeAnalysis &TypeInfo) {
 
   // Look through ExtractPenultimateElement (BuildVector ....).
   if (match(Def, m_VPInstruction<VPInstruction::ExtractPenultimateElement>(
-                      m_BuildVector()))) {
+                     m_BuildVector()))) {
     auto *BuildVector = cast<VPInstruction>(Def->getOperand(0));
     Def->replaceAllUsesWith(
         BuildVector->getOperand(BuildVector->getNumOperands() - 2));

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https://github.com/llvm/llvm-project/pull/165568