fixup! Create its own decoder for VMV0 register class

Author: mshockwave

llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp

@@ -293,6 +293,16 @@ static DecodeStatus DecodeVRM8RegisterClass(MCInst &Inst, uint32_t RegNo,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeVMV0RegisterClass(MCInst &Inst, uint32_t RegNo,
+                                            uint64_t Address,
+                                            const MCDisassembler *Decoder) {
+  if (RegNo)
+    return MCDisassembler::Fail;
+
+  Inst.addOperand(MCOperand::createReg(RISCV::V0));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus decodeVMaskReg(MCInst &Inst, uint32_t RegNo,
                                    uint64_t Address,
                                    const MCDisassembler *Decoder) {

llvm/lib/Target/RISCV/RISCVInstrInfoV.td

@@ -67,7 +67,6 @@ def VMaskOp : RegisterOperand<VMV0> {
 def VMaskCarryInOp : RegisterOperand<VMV0> {
   let ParserMatchClass = VMaskCarryInAsmOperand;
   let EncoderMethod = "getVMaskReg";
-  let DecoderMethod = "decodeVMaskReg";
 }
 
 def simm5 : RISCVSImmLeafOp<5> {