[RISCV] Remove ParserMatchClass and DecoderMethod from an operand only used by pseudos. NFC

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoXSf.td

@@ -30,8 +30,6 @@ def VCIX_XVW : VCIXType<0b1111>;
 // The payload and tsimm5 operands are all marked as ImmArg in the IR
 // intrinsic and will be target constant, so use TImmLeaf rather than ImmLeaf.
 class PayloadOp<int bitsNum> : RISCVOp, TImmLeaf<XLenVT, "return isUInt<" # bitsNum # ">(Imm);"> {
-  let ParserMatchClass = UImmAsmOperand<bitsNum>;
-  let DecoderMethod = "decodeUImmOperand<"# bitsNum # ">";
   let OperandType = "OPERAND_UIMM" # bitsNum;
 }