RFR(S): 8132720: Add tests which checks that Humongous objects are not moved after Full GC

[Kirill Zhaldbybin]

Hi!

Could you please review the following test?

The test allocates humongous objects, deletes some of them, calls full 
gc and checks that reachable humongous objects were not moved.

CR:
https://bugs.openjdk.java.net/browse/JDK-8132720

Webrev:
http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132720/webrev.02/

Thank you.

Regards, Kirill