RFR: 8337511: Implement JEP 404: Generational Shenandoah (Experimental) [v7]

[William Kemper]

On Wed, 20 Nov 2024 16:47:20 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> No, in single gen mode regions that are not `FREE` are affiliated with `YOUNG`.
>
> That's weird. We have `Young`, `Old` and `Global` generations. Why affiliation is not `Free`, `Young`, `Old`, and `Global` then?

Yes, it's a little weird. It didn't seem necessary to have a `Global` affiliation.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21273#discussion_r1850927526