RFR: 8148376: Test for PLAB behavior at evacuation failure.

[Michail Chernov]

Hi,

Could I have a review for this change, please:

Bug: https://bugs.openjdk.java.net/browse/JDK-8148376
Webrev: http://cr.openjdk.java.net/~mchernov/8148376/webrev.00/

This test provokes Evacuation Failure and checks PLAB statistics for 
this event.

This fix is also related to 
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2016-March/017197.html 
because uses LogParser.java.

Thanks
Michail