RFR: Allow adjusted capacity and used regions size to be equal

[Kelvin Nilsen]

On Tue, 13 Dec 2022 18:46:37 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Fix assertion which requires adjusted capacity to be larger than the used regions size (they may be equal).

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.org/shenandoah/pull/181