RFR: 8310574 GenShen: Should not update-references for in-place-promotions

[Y. Srinivas Ramakrishna]

On Thu, 22 Jun 2023 23:41:25 GMT, William Kemper <wkemper at openjdk.org> wrote:

> When a cycle _only_ promotes regions in place, it is not necessary to update refs.

Marked as reviewed by ysr (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/291#pullrequestreview-1496080120