RFR: backport of JDK-8061715 : gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before to 8u60

[Andrey Zakharov]

Hi, team
Summary: as in 8u60 whitebox lays in hotspot folder, backport is not 
clear. But simple.
webrev:
http://cr.openjdk.java.net/~azakharov/8076077/
bug:
https://bugs.openjdk.java.net/browse/JDK-8076077


Tested - looks ok, in Stockholm JPRT queue 
2015-05-06-170635.azakharov.auxdata

Thanks.