RFR: 8139903: G1EvacStats does not split log entries

[Michail Chernov]

Hi,

Please review this small fix for JDK-8139903 (G1EvacStats does not split 
log entries).

Webrev: http://cr.openjdk.java.net/~mchernov/8139903/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8139903

GC output does not have new line symbol between entries in case if used 
-XX:+PrintPLAB and -XX:-ResizePLAB. It happens because "\n" is printed 
in part of code which executes only if ResizePLAB is defined. This patch 
fixes it.

Thanks,
Misha