[7u8] Request for approval: 7161229 PriorityBlockingQueue keeps hard reference to last removed element

[David Holmes]

This is a direct backport of the changes that went into 8:

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

Review thread:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-June/010636.html


Thanks,
David Holmes