RFR: Assert that region usage accounting is only accessed in generational mode

[William Kemper]

On Wed, 10 May 2023 20:39:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

> There was one unrelated test failure in the github actions (running G1).

Yes, it's the latter scenario. The global generation exists in all modes, but the implementation of `used_regions` is only correct for the generational mode. The assert is intended to show that this specific method is only called in generational mode.

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PR Comment: https://git.openjdk.org/shenandoah/pull/278#issuecomment-1544194800