[CodeGen] Disable default copy ctor and copy assignment operator for AggressiveAntiDepBreaker

[yubing]

ping?

llvm/lib/CodeGen/AggressiveAntiDepBreaker.h

class LLVM_LIBRARY_VISIBILITY AggressiveAntiDepBreaker
 
     /// The state used to identify and rename anti-dependence registers.
     AggressiveAntiDepState *State = nullptr;
 
   public:
     AggressiveAntiDepBreaker(MachineFunction &MFi,
                           const RegisterClassInfo &RCI,
                           TargetSubtargetInfo::RegClassVector& CriticalPathRCs);
+    AggressiveAntiDepBreaker &
+    operator=(const AggressiveAntiDepBreaker &other) = delete;
+    AggressiveAntiDepBreaker(const AggressiveAntiDepBreaker &other) = delete;
     ~AggressiveAntiDepBreaker() override;
 
     /// Initialize anti-dep breaking for a new basic block.
     void StartBlock(MachineBasicBlock *BB) override;
 
     /// Identifiy anti-dependencies along the critical path
     /// of the ScheduleDAG and break them by renaming registers.
     unsigned BreakAntiDependencies(const std::vector<SUnit> &SUnits,