git: openjdk/loom: fibers: workaround for MethodExit events not posted sometimes

[duke]

Changeset: 9b83e966
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2020-12-21 10:07:47 +0000
URL:       https://git.openjdk.java.net/loom/commit/9b83e966

workaround for MethodExit events not posted sometimes

! src/hotspot/share/prims/jvmtiEnvThreadState.cpp
! src/hotspot/share/prims/jvmtiEnvThreadState.hpp
! src/hotspot/share/prims/jvmtiThreadState.cpp
! src/hotspot/share/prims/jvmtiThreadState.hpp
! src/hotspot/share/prims/jvmtiThreadState.inline.hpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/MethodExitTest/libMethodExitTest.cpp