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

llvm/lib/CodeGen/InterferenceCache.h

class LLVM_LIBRARY_VISIBILITY InterferenceCache {
   // The actual cache entries.
   Entry Entries[CacheEntries];
 
   // get - Get a valid entry for PhysReg.
   Entry *get(MCRegister PhysReg);
 
 public:
   InterferenceCache() = default;
-
+  InterferenceCache &operator=(const InterferenceCache &other) = delete;
+  InterferenceCache(const InterferenceCache &other) = delete;
   ~InterferenceCache() {
     free(PhysRegEntries);
   }
 
   void reinitPhysRegEntries();
 
   /// init - Prepare cache for a new function.
   void init(MachineFunction *mf, LiveIntervalUnion *liuarray,