move IsCmpOp out of lambda

Author: HanKuanChen

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -930,9 +930,7 @@ static InstructionsState getSameOpcode(ArrayRef<Value *> VL,
   unsigned AltOpcode = Opcode;
   unsigned AltIndex = std::distance(VL.begin(), It);
 
-  bool SwappedPredsCompatible = [&]() {
-    if (!IsCmpOp)
-      return false;
+  bool SwappedPredsCompatible = IsCmpOp && [&]() {
     SetVector<unsigned> UniquePreds, UniqueNonSwappedPreds;
     UniquePreds.insert(BasePred);
     UniqueNonSwappedPreds.insert(BasePred);