RFR: 8026043: Add regression test for JDK-8000831

[Evgeniya Stepanova]

Hi all,

Could you please review fix for 8026043? It is a regression test for 
8000831: Heap verification output incorrect/incomplete. Test check that 
gc log contains expected information
Originally patch was performed by Filipp Zhinkin in [1] , but review 
process was never finished.
Test adapted to use current testlibrary functionality.

bug: https://bugs.openjdk.java.net/browse/JDK-8026043
webrev: http://cr.openjdk.java.net/~eistepan/8026043/webrev.00/
[1] 
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013-October/008772.html

Thanks,
Jane

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