RFR: 8248133: SerialGC: Unify handling of all OopStorage instances in root processing

[Kim Barrett]

> On Jun 23, 2020, at 4:12 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to nify handling of all OopStorage instances in root processing for the Serial GC.
> 
> https://cr.openjdk.java.net/~stefank/8248133/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8248133
> 
> This removes the explicit enumeration of "strong" OopStorages in the Serial GC. This is a step towards allowing the Runtime code to add new OopStorages without having to update all GCs.
> 
> Tested with tier1-tier3
> 
> Thanks,
> StefanK

This change presumes we like JDK-8234502 :)

Looks good.