[M68k][NFC] Fix some unused variable warnings

Induced by variables that are only used in assertion statements. NFC.

Author: mshockwave

llvm/lib/Target/M68k/M68kInstrInfo.cpp

@@ -361,6 +361,7 @@ bool M68kInstrInfo::ExpandMOVX_RR(MachineInstrBuilder &MIB, MVT MVTDst,
 
   assert(RCDst && RCSrc && "Wrong use of MOVX_RR");
   assert(RCDst != RCSrc && "You cannot use the same Reg Classes with MOVX_RR");
+  (void)RCSrc;
 
   // We need to find the super source register that matches the size of Dst
   unsigned SSrc = RI.getMatchingMegaReg(Src, RCDst);
@@ -407,6 +408,7 @@ bool M68kInstrInfo::ExpandMOVSZX_RR(MachineInstrBuilder &MIB, bool IsSigned,
 
   assert(RCDst && RCSrc && "Wrong use of MOVSX_RR");
   assert(RCDst != RCSrc && "You cannot use the same Reg Classes with MOVSX_RR");
+  (void)RCSrc;
 
   // We need to find the super source register that matches the size of Dst
   unsigned SSrc = RI.getMatchingMegaReg(Src, RCDst);
@@ -746,6 +748,7 @@ void M68kInstrInfo::storeRegToStackSlot(
   const MachineFrameInfo &MFI = MBB.getParent()->getFrameInfo();
   assert(MFI.getObjectSize(FrameIndex) >= TRI->getSpillSize(*RC) &&
          "Stack slot is too small to store");
+  (void)MFI;
 
   unsigned Opc = getStoreRegOpcode(SrcReg, RC, TRI, Subtarget);
   DebugLoc DL = MBB.findDebugLoc(MI);
@@ -763,6 +766,7 @@ void M68kInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
   const MachineFrameInfo &MFI = MBB.getParent()->getFrameInfo();
   assert(MFI.getObjectSize(FrameIndex) >= TRI->getSpillSize(*RC) &&
          "Stack slot is too small to load");
+  (void)MFI;
 
   unsigned Opc = getLoadRegOpcode(DstReg, RC, TRI, Subtarget);
   DebugLoc DL = MBB.findDebugLoc(MI);

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

@@ -203,10 +203,9 @@ void M68kMCCodeEmitter::encodeInstruction(const MCInst &MI,
                                           SmallVectorImpl<char> &CB,
                                           SmallVectorImpl<MCFixup> &Fixups,
                                           const MCSubtargetInfo &STI) const {
-  unsigned Opcode = MI.getOpcode();
-
-  LLVM_DEBUG(dbgs() << "EncodeInstruction: " << MCII.getName(Opcode) << "("
-                    << Opcode << ")\n");
+  LLVM_DEBUG(dbgs() << "EncodeInstruction: " << MCII.getName(MI.getOpcode())
+                    << "(" << Opcode << ")\n");
+  (void)MCII;
 
   // Try using the new method first.
   APInt EncodedInst(16, 0U);