RFR: 8241141: Restructure humongous object allocation in G1

[Kim Barrett]

> On Apr 7, 2020, at 4:18 AM, Stefan Johansson <stefan.johansson at oracle.com> wrote:
>>>> Also, I think the preferred_node parameter name in expand_on_preferred_node
>>>> is confusing, since it's not obvious that it's a node index, and region
>>>> indexes abound in its vicinity.
>>> I agree, but we should handle this as a separate cleanup. Agree?
>> Changing the name doesn't seem worth a separate change.
> True, but I rather than changing it here, I think it should be included when cleaning up G1CH::new_region which uses expand_single_region.

So I should remember to mention this in the RFE I’m supposed to file for new_region.  OK.