[8u] Pick up 8u282 GA to sh/jdk8

[Roman Kennke]

Hi Aleksey,

> I would like to pick up the 8u282 GA to sh/jdk8.
> 
> Hotspot requires resolving the following conflict:
> 
> aarch64-port/jdk8u-shenandoah has:
>    Shenandoah: Fix racy update of code roots
>    
> https://hg.openjdk.java.net/aarch64-port/jdk8u-shenandoah/hotspot/rev/76dace090781 
> 
> 
> sh/jdk8 has:
>    [backport] 8229474: Shenandoah: Cleanup CM::update_roots()
>    https://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/03dc7e990da2
> 
> As far as I can tell, sh/jdk8 removes _update_code_cache, and so 
> aarch64-port/jdk8u-shenandoah change is no longer relevant. Therefore, I 
> accepted the sh/jdk8 side in that conflict.

Yes, that is correct. The aarch64-port/jdk8u-shenandoah was a 
conservative fix for the last release, and is superseded by the 
somewhat-less conservative change in sh/jdk8.

> Every other repo is pulled without merges.
> 
> Testing: hotspot_gc_shenandoah {fastdebug, release}

Good! Go!

Thanks,
Roman