RFR: 8365237: Remove unused SoftRefPolicy::_all_soft_refs_clear

[Kim Barrett]

On Mon, 11 Aug 2025 10:35:26 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing effectively dead code.
> 
> Test: tier1

Other than the explicit empty `~VM_GC_Ooperation()` that @tschatzl pointed
out, this looks good to me.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26722#pullrequestreview-3108970658