RFC: Pick up 11.0.4+4 to sh/jdk11

[Roman Kennke]

Good with me!

Roman


> The trivial merge from jdk-updates/jdk11u, at 11.0.4+4. Since there are no Hotspot changes to care
> about, and no Shenandoah changes since last tag, I would tag it immediately as shenandoah-jdk-11.0.4+4.
> 
> Changesets:
>   http://cr.openjdk.java.net/~shade/shenandoah/merges/jdk11-11.0.4%2b4/changesets.txt
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
>