RFR: 8357976: GenShen crash in swap_card_tables: Should be clean

[Kelvin Nilsen]

On Tue, 10 Jun 2025 20:14:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Degenerated cycles must also clean the `read` card table before swapping it with the `write` card table.

Thanks.  LGTM

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Marked as reviewed by kdnilsen (Committer).

PR Review: https://git.openjdk.org/jdk/pull/25735#pullrequestreview-2914990916