RFR: Bulk integration shenandoah/jdk8u -> aarch64-port/jdk8u-shenandoah 2019-04-29

[Zhengyu Gu]

Good to me.

-Zhengyu

On 4/29/19 3:14 PM, Roman Kennke wrote:
> Please review the following proposed changes:
> 
> This integrates changes from shenandoah/jdk8u into
> aarch64-port/jdk8u-shenandoah repository, reaching back to December 2018.
> It's bugfixes, improvements and new features that have been originally
> done in Shenandoah dev repo, and then backported to Shenandoah JDK8u
> repo and tested there for a while too.
> 
> Most of it is Shenandoah-only changes.
> 
> Short tour of shared-code changes:
> - Change in classLoaderStats.cpp introduces a new required+missing 
> object equals barrier.
> - Change in subnode.cpp *reverts* back to orginal upstream code because 
> of changed object equal barrier in C2.
> - arguments.cpp change is in fact in Shenandoah-only path.
> 
> List of changes:
> http://cr.openjdk.java.net/~rkennke/jdk8u-shenandoah-integration-2019-04-29/changes.txt 
> 
> 
> Complete Webrev:
> http://cr.openjdk.java.net/~rkennke/jdk8u-shenandoah-integration-2019-04-29/webrev-all.00/ 
> 
> 
> Thanks for reviewing!
> Roman