RFR: 8160827: gc/stress/TestStressG1Humongous.java fails with OOME

[Michail Chernov]

Hi,

Could I have a review for this change, please?

https://bugs.openjdk.java.net/browse/JDK-8160827
http://cr.openjdk.java.net/~mchernov/8160827/webrev.00/

Test gc/stress/TestStressG1Humongous.java fails on some hosts due to 
OOME. OOME is happened at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.addConditionWaiter. 
At my point of view, this is not related to humongous allocation and GC 
work. This change gives more free space for VM.

Tested on different configuration and different hosts - test passed.

Thanks,
Michail
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