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

[Maurizio Cimadamore]

On Wed, 2 Apr 2025 11:37:56 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> I've used `static` fields now to get out of the muddy waters of trusted final fields, records etc.
>
> I didn't mean to say "this is not true, so use a `static final` instead". What I meant was more "let's not dive into VM-specific details now" (see my other comment on the topic), and just focus on semantics instead. Then let's put all the constant-folding related stuff somewhere else. I liked using non-static final fields!

Basically: drop all references to "performance" and "constant folding" everywhere. And then introduce a section dedicated to that topic which talks a bit about how the content of a SV is trusted not to change by the JVM, which enables constant-folding optimizations.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23972#discussion_r2024654143