RFR: ShenandoahOOMDuringEvacALot

[Aleksey Shipilev]

On 10/23/2017 06:45 PM, Roman Kennke wrote:
> When I made my prototype I added some diagnostics code to provoke the failure path for
> OOM-during-evac very frequently. This proved to be very useful. I extracted this part from that
> change and post it here because I think it's useful, whichever way we go with the bit-mangling patch.
> 
> http://cr.openjdk.java.net/~rkennke/oomalot/webrev.00/

Looks good, except for:

 *) TestGCBasherWithShenandoah, TestGCLockerWithShenandoah, TestGCOldWithShenandoah:
   Combining "aggressive" and "ShenandoahVerify" explodes the testing time.

Thanks,
-Aleksey