RFC: Pick up 11.0.7+1 to sh/jdk11

[Roman Kennke]

Ok, let's do it. Thank you!

Roman

> Upstream published 11.0.7+1 tag. Let's pick it up to sh/jdk11.
> 
> The merge is not trivial, but simple enough. Changeset list:
>   https://cr.openjdk.java.net/~shade/shenandoah/merges/jdk11-11.0.7%2b1/changesets.txt
> 
> Merge changeset is way too large to be useful. So we would wait for builds to complete after this
> push, and then tag the result shenandoah-jdk-11.0.7+1.
> 
> Testing: hotspot_gc_shenandoah {fastdebug,release}
>