RFR [11]: 2018-10-23, Bulk backports to sh/jdk11

[Zhengyu Gu]

Good to me.

-Zhengyu

On 10/23/2018 01:31 PM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk11-20181023/webrev.01/
> 
> Let's get our every-Monday (ahem) backports back in order:
> 
>   [backport] Filter upstream tests for Shenandoah (part 1: tier1_gc)
>   [backport] Avoid false sharing by padding the ShenandoahEvacOOMHandler field in ShenandoahHeap
>   [backport] Support VerifyBeforeGC and VerifyAfterGC VM options
>   [backport] fix for PhaseIdealLoop::clone_loop_predicates_fix_mem()
>   [backport] Skip pre-evac verification and pacing on shortcut cycle path
>   [backport] Filter out TestPromotionToSurvivor.java test for Shenandoah
>   [backport] Protect more internal code from false sharing
> 
> Testing: tier3_gc_shenandoah {fastdebug|release}
> 
> -Aleksey
>