src/hotspot/share/gc/parallel/gcTaskThread.hpp

8221260: Initialize more class members on construction, remove some unused ones
Reviewed-by:

   uint _time_stamp_index;
 
   GCTaskTimeStamp* time_stamp_at(uint index);
   void add_task_timestamp(const char* name, jlong t_entry, jlong t_exit);
 
-  bool _is_working;                     // True if participating in GC tasks
-
   // Factory create and destroy methods.
   static GCTaskThread* create(GCTaskManager* manager,
                               uint           which,
                               uint           processor_id) {
     return new GCTaskThread(manager, which, processor_id);

@@ -83,11 +81,10
     return id();
   }
   uint processor_id() const {
     return _processor_id;
   }
-  void set_is_working(bool v) { _is_working = v; }
 };
 
 class GCTaskTimeStamp : public CHeapObj<mtGC>
 {
  private: