RFR: 8150676: Use BufferNode index

[Kim Barrett]

> On Mar 1, 2016, at 9:56 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
> Please review this change to PtrQueue and its derivatives to maintain
> the index in BufferNode where needed.  […]
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8150676
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8150676/webrev.00

Updated webrevs:
full: http://cr.openjdk.java.net/~kbarrett/8150676/webrev.01/
incremental: http://cr.openjdk.java.net/~kbarrett/8150676/webrev.01.inc/

> Testing:
> JPRT
> Aurora ad-hoc defaults + GC nightly + Runtime nightly

Passed JPRT.  In-progress rerun of Aurora ad-hoc defaults + GC nightly + Runtime nightly.