[SLP][NFC] Remove unused local variable in lambda (#156835)

Author: garthlei

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -11287,9 +11287,6 @@ void BoUpSLP::buildTreeRec(ArrayRef<Value *> VLRef, unsigned Depth,
     if (!canBuildSplitNode(VL, LocalState, Op1, Op2, ReorderIndices))
       return false;
 
-    SmallVector<Value *> NewVL(VL.size());
-    copy(Op1, NewVL.begin());
-    copy(Op2, std::next(NewVL.begin(), Op1.size()));
     auto Invalid = ScheduleBundle::invalid();
     auto *TE = newTreeEntry(VL, TreeEntry::SplitVectorize, Invalid, LocalState,
                             UserTreeIdx, {}, ReorderIndices);