re PR libgcj/16662 (IllegalMonitorStateException in EventQueue.getNextEvent():...

re PR libgcj/16662 (IllegalMonitorStateException in EventQueue.getNextEvent(): possible hash synchronization bug?)

	PR libgcj/16662
	* java/lang/natObject.cc (LOCK_LOG, LOG): Add debug tracing.
	(Almost everywhere): add LOG calls, fix, add comments.
	(_Jv_MonitorEnter): Replace masking of LOCKED bit with assertion.
	Add explicit check for LOCKED bit in slow case (PR 16662).
	(_Jv_MonitorExit): Add casts in debug-only code.
	Always release LOCKED bit before throwing exception.
	(_Jv_ObjectCheckMonitor): Lock may be held if lightweight lock
	isn't.  Handle easy cases without lock acquisition.
	(Object::wait): Use NotifyAll for lock inflation.

From-SVN: r85884