[AArch64] Use getMergeValues to simplify code. NFC (#150337)

Author: topperc

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -4223,7 +4223,6 @@ static SDValue lowerADDSUBO_CARRY(SDValue Op, SelectionDAG &DAG,
   SDValue OpCarryIn = valueToCarryFlag(Op.getOperand(2), DAG, InvertCarry);
 
   SDLoc DL(Op);
-  SDVTList VTs = DAG.getVTList(VT0, VT1);
 
   SDValue Sum = DAG.getNode(Opcode, DL, DAG.getVTList(VT0, FlagsVT), OpLHS,
                             OpRHS, OpCarryIn);
@@ -4232,7 +4231,7 @@ static SDValue lowerADDSUBO_CARRY(SDValue Op, SelectionDAG &DAG,
       IsSigned ? overflowFlagToValue(Sum.getValue(1), VT1, DAG)
                : carryFlagToValue(Sum.getValue(1), VT1, DAG, InvertCarry);
 
-  return DAG.getNode(ISD::MERGE_VALUES, DL, VTs, Sum, OutFlag);
+  return DAG.getMergeValues({Sum, OutFlag}, DL);
 }
 
 static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
@@ -4257,8 +4256,7 @@ static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
   Overflow =
       DAG.getNode(AArch64ISD::CSEL, DL, MVT::i32, FVal, TVal, CCVal, Overflow);
 
-  SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
-  return DAG.getNode(ISD::MERGE_VALUES, DL, VTs, Value, Overflow);
+  return DAG.getMergeValues({Value, Overflow}, DL);
 }
 
 // Prefetch operands are: