RFR: 8333750: GenShen: Only instantiate young/old generations in generational mode [v3]

[Y. Srinivas Ramakrishna]

On Tue, 11 Jun 2024 00:23:06 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Yes, it is a bug fix. I'll pull it out into a separate PR.
>
> Separate PR for this here: https://github.com/openjdk/shenandoah/pull/448

Thanks for pulling this out separately. I do think this is subtle and we should (in the fullness of time) make this idiom a bit cleaner and less fragile and uniform in terms of the representation of the state machine that can be used by both the concurrent and the degenerate resumptions.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/444#discussion_r1634123989