RFR: 8202081: Introduce CollectedHeap::is_oop()

[Roman Kennke]

I think it makes sense and patch looks good too.

Roman

> I'd like to propose that we add a virtual CollectedHeap::is_oop()
> function, so that GCs can add GC specific checks when verifying oops.
> 
> We've been running with this patch in the ZGC repository for a while,
> but the patch is ZGC agnostic:
> http://hg.openjdk.java.net/zgc/zgc/rev/66eb1ad3de72
> https://bugs.openjdk.java.net/browse/JDK-8202081
> 
> (I can create a webrev if needed)
> 
> Thanks,
> StefanK


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