RFR [8]: 2018-10-18, Bulk backports to sh/jdk8

[Roman Kennke]

It looks good to me. Oh man, what a chore! Well done!

Would be good if Zhengyu could look at it too.

Roman

> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20181018/webrev.01/
> 
> There were many unclean applies and specific whitespace changes, please take a careful look.
> 
> Changes include:
> 
>  [backport] Partial infrastructure for suspendible workers
>  [backport] Fix up superfluous changes against upstream
>  [backport] Readjust ShenandoahStrDedupStress test to avoid timeout
>  [backport] Assert that Shenandoah does not trip JDK-8211926
>  [backport] Added a few missed worker sessions for worker tasks
>  [backport] Remove unused SA ShenandoahHeapRegionSet.java
>  [backport] Add JFR parallel and concurrent events (infrastructure)
>  [backport] Remove ShenandoahCompileCheck
>  [backport] Clean up Shenandoah configurations in shared tests
>  [backport] A few more missing object equals barriers
>  [backport] c2 verification pass fixes for CAS
>  [backport] Move HdrSeq and BinaryMagnitudeSeq into Shenandoah utilities
>  [backport] Enable NUMA by default
>  [backport] Force termination logic is inverted
>  [backport] Need to step over GC barriers in Node::eqv_uncast()
>  [backport] Fixed ShenandoahStrDedupStress test that causes negative index OOB exception
> 
> Testing: hotspot_tier3_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>