[M68k] Fix assertion build after cc6a5ea

Author: MaskRay

llvm/lib/Target/M68k/MCTargetDesc/M68kMCCodeEmitter.cpp

@@ -204,7 +204,7 @@ void M68kMCCodeEmitter::encodeInstruction(const MCInst &MI,
  SmallVectorImpl<MCFixup> &Fixups,
  const MCSubtargetInfo &STI) const {
  LLVM_DEBUG(dbgs() << "EncodeInstruction: " << MCII.getName(MI.getOpcode())
- << "(" << Opcode << ")\n");
+ << "(" << MI.getOpcode() << ")\n");
  (void)MCII;
 
  // Try using the new method first.