RFR: 8325673: GenShen: Share Reserves between Old and Young Collector

[Kelvin Nilsen]

On Mon, 12 Feb 2024 18:22:42 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> Allow young-gen Collector reserve to share memory with old-gen Collector reserve in order to support prompt processing of mixed evacuations, as constrained by ShenandoahOldEvacRatioPercent.

After merging, I'm experiencing many unsuccessful GHA tests.  These were apparently introduced by the merge.

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PR Comment: https://git.openjdk.org/shenandoah/pull/395#issuecomment-2189646618