git: openjdk/loom: fibers: fix 8279451: serviceability/jvmti/vthread/VThreadTest/VThreadTest.java failing in loom repo

[duke]

Changeset: 0259e99a
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2022-01-06 15:27:12 +0000
URL:       https://git.openjdk.java.net/loom/commit/0259e99ae7d9f7daee6e44b8d9536bb086271693

fix 8279451: serviceability/jvmti/vthread/VThreadTest/VThreadTest.java failing in loom repo

! src/hotspot/share/prims/jvmtiExport.cpp
! src/hotspot/share/prims/jvmtiExtensions.cpp
! test/hotspot/jtreg/serviceability/jvmti/vthread/VThreadTest/libVThreadTest.cpp