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 […]
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8150676
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8150676/webrev.00

I forgot to update the copyright for satbMarkQueue.cpp.  Will fix before push.