RFR: 8333930: GenShen: Check for cancellation of old mark after final mark

[Y. Srinivas Ramakrishna]

On Tue, 11 Jun 2024 00:08:18 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This is the old generation mark version of https://github.com/openjdk/jdk/pull/19434

Marked as reviewed by ysr (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/448#pullrequestreview-2109223141