Review comments 2

Change-Id: I8b15558af0c8b23ff8c769d1a01323a87068f6ef

Author: jrbyrnes

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -22699,10 +22699,8 @@ bool SLPVectorizerPass::vectorizeChainsInBlock(BasicBlock *BB, BoUpSLP &R) {
             // Sort on ExtractElementInsts primarily by vector operands. Prefer
             // program order of the vector operands.
             if (E1->getVectorOperand() != E2->getVectorOperand()) {
-              const Instruction *V1 =
-                  dyn_cast<Instruction>(E1->getVectorOperand());
-              const Instruction *V2 =
-                  dyn_cast<Instruction>(E2->getVectorOperand());
+              const auto *V1 = dyn_cast<Instruction>(E1->getVectorOperand());
+              const auto *V2 = dyn_cast<Instruction>(E2->getVectorOperand());
               if (!V1 || !V2)
                 continue;
               if (V1->getParent() != V2->getParent())