RFR/RFC: Shenandoah integration 2021-03-11

[Roman Kennke]

Looks good to me!

Thanks,
Roman

> Hi,
> 
> I would like to integrate the regular update of Shenandoah 8u to our 
> integration repository, aarch64-port/jdk8u-shenandoah. It comes with a 
> few large features:
>   - Self-fixing load barriers
>   - JFR events support
>   - ShenadnoahSoftMaxHeapSize support
>   - Other cleanups and bugfixes
> 
> Webrev:
>    
> https://cr.openjdk.java.net/~shade/shenandoah/merges/aarch64-port-8u-20210311/webrev.01/ 
> 
> 
> There is no merge changeset, as shenandoah/jdk8 forest is clean 
> downstream of integration repository. I am tagging the whole thing as 
> aarch64-shenandoah-jdk8u292-b05-shenandoah-merge-2021-03-11.
> 
> Testing: hotspot_gc_shenandoah; it also runs pretty stably in our CIs, 
> and we have no user bugreports from our 8u nightlies
>