Request for approval: 7047325 - 7u-dev

[Seán Coffey]

CR 7047325 is an internal RFE : Internal API to improve management of 
direct buffers

This RFE was introduced in a 6 update release and with jdk 7u & jdk 8 in 
the open, I'm porting this change forward from the proprietary jdk6 
updates. The change adds an internal API to improve the management of 
direct buffers.

The changeset is identical is that which recently went into jdk8/tl :

http://hg.openjdk.java.net/jdk8/tl/jdk/rev/ddcb874581eb

Regards,
Sean.