(13) RFR (XS): 8226917: jvmti/scenarios/contention/TC04/tc04t001/TestDescription.java fails on jvmti->InterruptThread (JVMTI_ERROR_THREAD_NOT_ALIVE)

[serguei.spitsyn at oracle.com]

Please, review a test bug fix for:
https://bugs.openjdk.java.net/browse/JDK-8226917

Webrev:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8226917-mon-events-correction2.1/ 



Summary:
   One more fragment in the native agent was overlooked and is not 
needed anymore
   after the fix of JDK-8223736 which implemented more reliable sync 
approach.
   The error code JVMTI_ERROR_THREAD_NOT_ALIVE started to be seen because
   the sleep timeout changed to be shorter. Now, the thread holding the 
monitor
   is able to notice the enterEventsCount was increased by the 
MonitorContendedEnter
   event callback and finish before the callback attempts to interrupt 
it with the
   JVMTI InterruptThread.


Testing:
   A mach5 submission is in progress.

Thanks,
Serguei