RFR: Bulk backport to shenandoah/jdk11

[Roman Kennke]

Hi Aleksey,

>> Notable changeset is:
>> 8217717: ZGC: Broken oop map in C1 load barrier stub
> 
> I am not sure we can accept cherry-picked / double patches in sh/jdk11, which serves as our
> integration repository. Is there really no way to make this Shenandoah-specific for a while, until
> the upstream fix arrives via 11u-updates?

That might be difficult. We could probably not call the super
implementation of resolve_address() and do all that work in ShBSC1
instead, and correctly there. I'll see what I can do.

Roman