[8u60] Request for Approval: 8068418: NotificationBufferDeadlockTest.java throw exception: java.lang.Exception: TEST FAILED: Deadlock detected

[shanliang]

Please approve this clean backport:

Review: 
http://mail.openjdk.java.net/pipermail/serviceability-dev/2015-January/016307.html
JDK 9 changeset: http://hg.openjdk.java.net/jdk9/dev/jdk/rev/a11462e42173
bug: https://bugs.openjdk.java.net/browse/JDK-8068418

thanks,
Shanliang