Request for Review (XS) - 8149643: Remove check of counters in VirtualSpaceNode::inc_container_count

[Kim Barrett]

> On Feb 12, 2016, at 12:39 AM, Jon Masamitsu <jon.masamitsu at oracle.com> wrote:
> 
> Version 2 of the webrev.   I've hoisted the first verification out of
> both loops in retire() and moved the second one out of the inner
> loop.  I've also added the verification to the purge() method because
> it is there that the count is used and an incorrect value could
> go unnoticed.
> 
> http://cr.openjdk.java.net/~jmasa/8149643/webrev.01/

Looks good.