Code review request: 7188594 Print statistic collected by NMT with VM flag

[Zhengyu Gu]

This is a simple RFE, that allows VM to dump collected native memory

tracking data before exits.

CR: http://bugs.sun.com/view_bug.do?bug_id=7188594
Webrev: http://cr.openjdk.java.net/~zgu/7188594/webrev.00/

Thanks,

-Zhengyu