RFR: 8311599 GenShen: Missing card mark barrier when processing references

[Y. Srinivas Ramakrishna]

On Thu, 6 Jul 2023 20:20:17 GMT, William Kemper <wkemper at openjdk.org> wrote:

> When reference processing threads operate on the discovered list, they may create old-to-young pointers. Such pointers need to be recorded in the remembered set.

Marked as reviewed by ysr (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/294#pullrequestreview-1517367616