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

[Per Minborg]

On Wed, 2 Apr 2025 18:33:22 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 136:
> 
>> 134:         assertTrue(cached.toString().contains(Value.THIRTEEN + "=.unset"));
>> 135:         assertTrue(cached.toString().contains(Value.FORTY_TWO + "=.unset"), cached.toString());
>> 136:         assertTrue(cached.toString().endsWith("}"));
> 
> Not possible to test full toString() representation?

The order in which mappings appear is unspecified, unfortunately.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2026610510