RFR: 8367981: Update CompactHashtable for readability [v5]

[Hamlin Li]

On Wed, 24 Sep 2025 22:20:15 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   rename 2
>
> LGTM!

@iklam @matias9927 Thank you for reviewing!

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PR Comment: https://git.openjdk.org/jdk/pull/27360#issuecomment-3350552557