RFR 8085978 LinkedTransferQueue<T>.spliterator can report LTQ.Node object, not T

[Paul Sandoz]

Hi,

Please review:

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8085978-linked-transfer-queue-traverse/webrev/

The LinkedTransferQueue's spliterator can erroneously report internal nodes when traversing.

The fix is cherry picked from the 166 repo (other mostly refactoring-based changes will occur later on with bulk updates). I would also like to backport to 8u60.

Paul.