RFR (S): 8015972: Refactor the sending of the object count after GC event

[Erik Helin]

Hi all,

this small change refactors the way the object count after GC trace
event is sent.

Webrev:
http://cr.openjdk.java.net/~ehelin/8015972/webrev.00/

Bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8015972

Testing:
JPRT

Thanks,
Erik