RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v25]

[Per Minborg]

On Wed, 2 Apr 2025 09:26:52 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/StableValue.java line 461:
>> 
>>> 459:      * An unset stable value has no content.
>>> 460:      * <p>
>>> 461:      * The returned stable value is not {@link Serializable}.
>> 
>> I find the claim about serializable a bit odd here. Perhaps in some `implSpec`/`apiNote` at the toplevel?
>
> Same in other factories...

We had that originally and then I got the comment to move them to the factories so I am happy to do either as soon as we agree on the best way to do it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2024774672