RFR: 8365237: Remove unused SoftRefPolicy::_all_soft_refs_clear [v2]

[Albert Mingkun Yang]

On Tue, 12 Aug 2025 08:14:58 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Trivial removing effectively dead code.
>> 
>> Test: tier1
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26722#issuecomment-3178924678