RFR [8u]: Bulk backport to sh/jdk8u

[Roman Kennke]

Am 16.10.2017 um 23:59 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20171016/webrev.01/
>
> This change backports most of the outstanding work to sh/jdk8u. This is similar to pending backport
> to sh/jdk9, but for 8u.
>
> Changes include:
>
> rev 10139 : [backport] Remove ShenandoahGCWorkerPerJavaThread flag
> rev 10140 : [backport] Double check for UseShenandoahGC in WB expand
> rev 10141 : [backport] Verifier should print verification label at liveness verification
> rev 10142 : [backport] Mark bitmap slices commit/uncommit + Aggregated bitmap slicing
> rev 10143 : [backport] Fix (external) heap iteration + TestHeapDump should unlock aggressive heuristics
> rev 10144 : [backport] Pauses that do not affect heap occupancy should not report heap
> rev 10145 : [backport] Make sure -XX:+ShenandoahVerify comes first in the tests
> rev 10146 : [backport] Add -XX:+ShenandoahVerify to more interesting tests
> rev 10147 : [backport] Clean up dead code
>
> I had to rewrite the runner for TestHeapDump JVMTI test to make it runnable in 8u. Also,
> ShenandoahHeap needed touchups to implement oop_iterate properly.
>
> Again, I need sign-offs from everybody for this one too.
>
> Testing: hotspot_gc_shenandoah {fastdebug|release}
>
> Thanks,
> -Aleksey
>
That looks good to me! Thanks for doing that!

Roman