Code review request: 7191124 Optimized build is broken due to inconsistent use of DEBUG_ONLY and NOT_PRODUCT macros in NMT

[Zhengyu Gu]

When I changed MemTracker::print_tracker_stats() method from DEBUG_ONLY 
to NOT_PRODUCT, I did not properly update all references, which caused 
the build failure.  Please review the fix.


CR: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7191124
Webrev: http://cr.openjdk.java.net/~zgu/7191124/webrev.00/

Thanks,

-Zhengyu