RFR: 8309874: NMethod barriers may remain armed when regions are promoted in place

[Kelvin Nilsen]

On Wed, 14 Jun 2023 20:30:03 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Genshen runs in-place promotions during the evacuation phase. If the cycle is _only_ performing in-place promotions, it should not arm NMethod barriers. The barriers are now only armed and disarmed if the collection set is not empty.

Thanks for fixing this.

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Marked as reviewed by kdnilsen (no project role).

PR Review: https://git.openjdk.org/shenandoah/pull/286#pullrequestreview-1480270651