[AMDGPU][MC][GFX11] Correct disassembly of VOP3.DPP8 opcodes

[dp]

Summary

Fix bug 56163.
Add W32/W64 tests for all VOP3.DPP opcodes.

[Joe_Nash]

Thanks for all the tests, I only verified a couple but it seems reasonable. LGTM.

llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp

 
 // We must check FI == literal to reject not genuine dpp8 insts, and we must
 // first add optional MI operands to check FI
 DecodeStatus AMDGPUDisassembler::convertDPP8Inst(MCInst &MI) const {
   unsigned Opc = MI.getOpcode();
   unsigned DescNumOps = MCII->get(Opc).getNumOperands();
   if (MCII->get(Opc).TSFlags & SIInstrFlags::VOP3P) {
     convertVOP3PDPPInst(MI);
-  } else if (MCII->get(Opc).TSFlags & SIInstrFlags::VOPC) {
+  } else if ((MCII->get(Opc).TSFlags & SIInstrFlags::VOPC) ||
+             AMDGPU::isVOPC64DPP(Opc)) {
     convertVOPCDPPInst(MI);
   } else {
     // Insert dummy unused src modifiers.
     if (MI.getNumOperands() < DescNumOps &&
         AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0_modifiers) != -1)
       insertNamedMCOperand(MI, MCOperand::createImm(0),
                            AMDGPU::OpName::src0_modifiers);