RFR: 8325081: Move '_soft_ref_policy' to 'CollectedHeap' [v2]

[Lei Zaakjyu]

On Sat, 3 Feb 2024 16:13:24 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

>> trivial
>
> Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   construct '_soft_ref_policy' explicitly

thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/17693#issuecomment-1927598071