[RISCV][NFC] Simplified code for integer promotion setcc/vp.setcc

[craig.topper]

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

1970

The opcode checking assert was useful. Don't delete it.

[craig.topper]

LGTM

llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp

 SDValue DAGTypeLegalizer::PromoteIntOp_SETCC(SDNode *N, unsigned OpNo) {
   assert(OpNo == 0 && "Don't know how to promote this operand!");
 
   SDValue LHS = N->getOperand(0);
   SDValue RHS = N->getOperand(1);
   PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(2))->get());
 
   // The CC (#2) is always legal.
-  if (N->getNumOperands() == 3)
+  if (N->getOpcode() == ISD::SETCC)
     return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2)), 0);
-
-  assert(N->getNumOperands() == 5 && "Unexpected number of operands!");
-  assert(N->getOpcode() == ISD::VP_SETCC && "Expected VP_SETCC opcode");
-
   return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2),
                                         N->getOperand(3), N->getOperand(4)),
                  0);
 }
 
 SDValue DAGTypeLegalizer::PromoteIntOp_Shift(SDNode *N) {
   return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
                                 ZExtPromotedInteger(N->getOperand(1))), 0);