RFR(S): 8132713: Add tests which check that Humongous objects behave as expected after finishing ConcMark Cycle

[Kirill Zhaldbybin]

Dear all,

Could you please review this fix for 8132713?

This fix adds two CMC scenarios to 
gc/g1/humongousObjects/objectGraphTest/TestObjectGraphAfterGC.java which 
creates different types of object graphs with Object arrays as nodes (to 
make them humongous) and checks that after different types GCs objects' 
graphs were handled correctly.

During first CMC scenario the test expects that weakly reachable 
non-humongous nodes which are not referenced by weakly reachable 
humongous nodes should be collected and other weakly reachable nodes 
should not be collected (since weakly reachable non-humongous nodes are 
in young gen and during CMC they are handled as strong roots).
During second CMC scenario the test expects that all weakly reachable 
nodes should be collected since non-humongous nodes were previously 
promoted to old gen.
During both scenarios softly reachable nodes should not be collected.

WebRev: http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132713/webrev.00/
CR: https://bugs.openjdk.java.net/browse/JDK-8132713

Thank you.

Regards, Kirill
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