RFR [8]: Bulk backports to sh/jdk8u

[Roman Kennke]

Am 30.04.2018 um 18:10 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20180430/webrev.01/
> 
> This backports recent work to sh/jdk8u:
> 
>  [backport] Testbug: VerifyJCStressTest leaks memory
>  [backport] Remove ShenandoahMarkCompactBarrierSet
>  [backport] Isolate shenandoahVerifier from stray headers
>  [backport] Wipe out ShenandoahStoreCheck implementation
>  [backport] Fix broken asserts in ShenandoahSharedEnumFlag
>  [backport] Some smallish ShHeapRegionSet changes
>  [backport] Shenandoah/SPARC barrier stubs
>  [backport] Shenandoah/Zero barrier stubs
> 
> Testing: x86_64 {fastdebug|release}, adhoc builds on other platforms
> 
> Thanks,
> -Aleksey
> 

Looks good too!
Thank you!
Roman