hg: jdk8/tl/jdk: 7161229: PriorityBlockingQueue keeps hard reference to last removed element

[david.holmes at oracle.com]

Changeset: 94b525ce3653
Author:    dholmes
Date:      2012-06-27 01:36 -0400
URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/94b525ce3653

7161229: PriorityBlockingQueue keeps hard reference to last removed element
Reviewed-by: dholmes, forax, alanb
Contributed-by: Doug Lea <dl at cs.oswego.edu>

! src/share/classes/java/util/concurrent/PriorityBlockingQueue.java
! test/java/util/concurrent/BlockingQueue/LastElement.java