[RISCV] Move hasOneUse() call after opcode check.

hasOneUse can be more expensive for nodes with multiple outputs.
It's better to check the opcode first to skip nodes with multiple
outputs.

I have not seen an issue from this, just noticed while reviewing
code for a possible enhancement.

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -11999,7 +11999,7 @@ static SDValue performXORCombine(SDNode *N, SelectionDAG &DAG,
   }
 
   // Fold (xor (setcc constant, y, setlt), 1) -> (setcc y, constant + 1, setlt)
-  if (N0.hasOneUse() && N0.getOpcode() == ISD::SETCC && isOneConstant(N1)) {
+  if (N0.getOpcode() == ISD::SETCC && isOneConstant(N1) && N0.hasOneUse()) {
     auto *ConstN00 = dyn_cast<ConstantSDNode>(N0.getOperand(0));
     ISD::CondCode CC = cast<CondCodeSDNode>(N0.getOperand(2))->get();
     if (ConstN00 && CC == ISD::SETLT) {