RFR: 8314100: G1: Improve collection set candidate selection code [v3]

[Thomas Schatzl]

On Fri, 18 Aug 2023 14:42:15 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   ayang review
>
> Marked as reviewed by iwalulya (Reviewer).

Thanks @walulyai @albertnetymk for your reviews

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PR Comment: https://git.openjdk.org/jdk/pull/15243#issuecomment-1685881827