RFR: 8352969: G1: Improve testability of optional collections [v3]

[Guanqiang Han]

On Wed, 27 Aug 2025 09:22:53 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Guanqiang Han has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update g1YoungCollector.cpp
>>   
>>   format fix
>
> Changes requested by tschatzl (Reviewer).

Hi @tschatzl , thank you for your comments. I've updated the PR and added a regression test. Please take a look when you have time.

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PR Comment: https://git.openjdk.org/jdk/pull/26880#issuecomment-3241523625