RFR: 8339611: GenShen: Simplify ShenandoahOldHeuristics::trigger_collection_if_fragmented [v2]

[William Kemper]

On Sun, 15 Sep 2024 02:43:47 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> This pull request contains a backport of commit c38b31af from the openjdk/shenandoah repository.
>> 
>> The commit being backported was authored by Kelvin Nilsen on 13 Sep 2024 and was reviewed by William Kemper.
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove dependency on checkedCast.hpp

Marked as reviewed by wkemper (Committer).

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PR Review: https://git.openjdk.org/shenandoah-jdk21u/pull/89#pullrequestreview-2307140040