RFR: Add "verify jcstress" acceptance test

[Roman Kennke]

Am 17.07.2017 um 12:56 schrieb Aleksey Shipilev:
> Hi,
>
> Recent bug in shenandoah/8u had slipped under the radar, because we don't have
> any test that runs with -XX:+ShenandoahVerifyOptoBarriers included into
> hotspot_gc_shenandoah.
>
> Add one:
>   http://cr.openjdk.java.net/~shade/shenandoah/tests-verify-jcstress/webrev.01/
>
> This goes to 10, 9, 8u.
>
> Testing: hotspot_gc_shenandoah
>
> Checked it fails with a few obvious injected bugs in compiler (reverting
> arraycopy verification fix), in runtime (e.g. using == instead of
> oopDesc::equals), etc.
>
> Thanks,
> -Aleksey
>
That is a good idea. Please push!

Roman