RFR: 8338528: GenShen: Cleanup shenandoahHeapRegion [v2]

[Kelvin Nilsen]

On Tue, 20 Aug 2024 17:00:48 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> * Break up huge methods in shenandoahHeapRegion
>> * Clarify comments
>> * Change confusing method names
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Simplify case for scanning all references within humongous object

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/476#pullrequestreview-2249154106