git: openjdk/loom: fibers: fix issues in JVMTI getCurrentContendedMonitor and related test

[duke]

Changeset: 61cd331c
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2021-08-26 20:53:23 +0000
URL:       https://git.openjdk.java.net/loom/commit/61cd331c5cfe3b928267fc859e558ebee25d81a7

fix issues in JVMTI getCurrentContendedMonitor and related test

! src/hotspot/share/prims/jvmtiEnv.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadMonitorTest/VThreadMonitorTest.java
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadMonitorTest/libVThreadMonitorTest.cpp