RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v33]

[Per Minborg]

On Wed, 2 Apr 2025 18:29:06 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add info that Map#values and Map#entrySet are stable
>
> test/jdk/java/lang/StableValue/StableFunctionTest.java line 86:
> 
>> 84:         basic(inputs, MAPPER);
>> 85:         basic(inputs, _ -> null);
>> 86:     }
> 
> Test for null mapper?

There is a test where a `null` mapper is provided under the `factoryInvariants` test.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2026575292