RFR: 8342214: GenShen: Reduce code duplication in shFreeSet with iterator abstraction

[Kelvin Nilsen]

On Mon, 14 Oct 2024 22:07:41 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Introduce `ShenandoahLeftRightIterator` and `ShenandoahRightLeftIterator` classes to encapsulate allocation bias to one side of the heap or the other.

Thanks.  Looks like a nice improvement.

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Marked as reviewed by kdnilsen (Committer).

PR Review: https://git.openjdk.org/shenandoah/pull/512#pullrequestreview-2372856073