RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v8]

[Johannes Graham]

On Tue, 25 Mar 2025 15:52:07 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> Implement JEP 502.
>> 
>> The PR passes tier1-tier3 tests.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revamp toString() methods

test/jdk/java/lang/StableValue/StableValueTest.java line 188:

> 186:         stable.trySet(stable);
> 187:         String toString = stable.toString();
> 188:         assertEquals("(this StableValue)", toString);

Instead of checking the toString format, an option would be to use assertDoesNotThrow to ensure there was no StackOverflowException

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2013075831