Use JNI refs for virtual thread objects during JVMTI suspend #16661
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(jthread)&walkVirtualThread is not a JNI ref, and it will not be
updated by the GC when VM access is released in
suspendhelper.cpp::suspendThread.
Now, JNI refs are used to pass virtual thread objects during JVMTI
suspend. This assures that the GC updates them.
Related: #16593
Signed-off-by: Babneet Singh sbabneet@ca.ibm.com