Integrated: 8336106: Genshen: Fix use of missing API in Shenandoah Old Heuristic test

[Kelvin Nilsen]

On Wed, 10 Jul 2024 16:17:40 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The recent fixes for the Shenandoah Old Heuristic test used an API that hasn't been backported. This change uses a different API available in 21 to achieve the same end.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/65#pullrequestreview-2169784648