RFC: Pick up 11.0.8+1 to sh/jdk11

[Roman Kennke]

It looks ok to me. Better to have Roland look over it too?

Roman


> Upstream had published 11.0.8+1, let's pick it up to sh/jdk11.
> 
> The merge was simple, except one thing. I had to apply the missing Shenandoah hunk from 8231550 to
> unbreak the tests:
>   https://hg.openjdk.java.net/jdk/jdk/rev/bada0782842a
> 
> I will tag it shenandoah-jdk-11.8.0+1 after some post-integration testing.
> 
> Testing: hotspot_gc_shenandoah {fastdebug, release}
>