RFR: 8321816: GenShen: Provide a minimum amount of time for an old collection to run

[William Kemper]

On Sat, 13 Jan 2024 00:21:14 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Resolved conflict with `can_unload_classes_normal`.

The comment conflicted with the `can_unload_classes_normal` method, which was changed in upstream tip. Historically, our backport efforts have been limited to only changes made directly to `shenandoah/master`.  We may need to revise this policy.

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PR Comment: https://git.openjdk.org/shenandoah-jdk21u/pull/14#issuecomment-1890226400