src/hotspot/share/gc/z/zCollectedHeap.hpp

   virtual size_t block_size(const HeapWord* addr) const;
   virtual bool block_is_obj(const HeapWord* addr) const;
 
   virtual void register_nmethod(nmethod* nm);
   virtual void unregister_nmethod(nmethod* nm);
+  virtual void flush_nmethod(nmethod* nm);
   virtual void verify_nmethod(nmethod* nmethod);
 
   virtual WorkGang* get_safepoint_workers();
 
   virtual jlong millis_since_last_gc();