RFR(S): 8132711: Add tests which check that Humongous objects behave as expected after Mixed GC

[Thomas Schatzl]

Hi,

On Wed, 2016-05-11 at 14:22 +0300, Kirill Zhaldbybin wrote:
> Dear all,
> 
> Could you please review this fix for 8132711?
> 
> This fix adds Mixed GC scenario 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 Mixed GC scenario the test expects that all weakly reachable 
> nodes should be collected since non-humongous nodes were previously 
> promoted to old gen and several gc options were specified to
> guarantee 
> that mixed gc collects all weakly unreachable objects in old gen.
> Softly reachable nodes should not be collected.
> 
> WebRev: http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132711/webr
> ev.00/
> CR: https://bugs.openjdk.java.net/browse/JDK-8132711
> 

  looks okay.

Thomas