8311823: JFR: Uninitialized EventEmitter::_thread_id field

Backport-of: 9688ec2d0d9fd830d993454ea093b68b0f85ebe7

Author: elifaslan1

src/hotspot/share/jfr/leakprofiler/checkpoint/eventEmitter.hpp

@@ -44,7 +44,6 @@ class EventEmitter : public CHeapObj<mtTracing> {
   const JfrTicks& _end_time;
   Thread* _thread;
   JfrThreadLocal* _jfr_thread_local;
-  traceid _thread_id;
 
   EventEmitter(const JfrTicks& start_time, const JfrTicks& end_time);
   ~EventEmitter();