[jdk23u] RFR: 8336640: Shenandoah: Parallel worker use in parallel_heap_region_iterate

[duke]

On Tue, 17 Sep 2024 23:26:43 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Clean backport. This is a performance enhancement with no changes outside of Shenandoah.

@earthling-amzn 
Your change (at version da30c4f406d41333c3cfd72c0efd2d5af4751bb3) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk23u/pull/101#issuecomment-2361873955