git: openjdk/loom: fibers: Use GetThreadInfo to get vthreads ThreadGroup rather than using the stashed away ThreadGroup we noted for an earlier carrier thread.

[duke]

Changeset: 0e4084ef
Author:    chris.plummer <chris.plummer at oracle.com>
Date:      2020-02-21 23:22:37 +0000
URL:       https://git.openjdk.java.net/loom/commit/0e4084ef

Use GetThreadInfo to get vthreads ThreadGroup rather than using the stashed away ThreadGroup we noted for an earlier carrier thread.

! src/jdk.jdwp.agent/share/native/libjdwp/ThreadReferenceImpl.c
! src/jdk.jdwp.agent/share/native/libjdwp/eventHandler.c