git: openjdk/loom: fibers: Change ReferenceQueue to use j.u.c locks

[duke]

Changeset: e3cc6e74
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-10-12 18:50:07 +0000
URL:       https://git.openjdk.java.net/loom/commit/e3cc6e74d1d93cddf5a8430ae60dfe432cec0d2b

Change ReferenceQueue to use j.u.c locks

! src/java.base/share/classes/java/lang/VirtualThread.java
! src/java.base/share/classes/java/lang/ref/ReferenceQueue.java
! src/java.base/share/classes/java/util/concurrent/ForkJoinPool.java
! src/java.base/share/classes/java/util/concurrent/ForkJoinTask.java
! src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedLongSynchronizer.java
! src/java.base/share/classes/java/util/concurrent/locks/AbstractQueuedSynchronizer.java
+ src/java.base/share/classes/java/util/concurrent/locks/ForkJoinPoolHelper.java
! test/hotspot/jtreg/serviceability/sa/ClhsdbInspect.java