RFR: 8367476: Shenandoah: Remove use of CollectedHeap::_soft_ref_policy [v2]

[Francesco Andreuzzi]

On Fri, 12 Sep 2025 15:18:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Francesco Andreuzzi has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - eagerly initialize to always-clear
>>  - move to gccause
>
> I have reviewed all non-Shenandoah code.

Thanks for your review @albertnetymk and @earthling-amzn.

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PR Comment: https://git.openjdk.org/jdk/pull/27239#issuecomment-3300021618