RFR: 8356255: Add Stable Field Updaters to allow efficient lazy field evaluations [v2]

[Daniel Fuchs]

On Tue, 6 May 2025 14:40:46 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This sketch shows how "Stable Updaters" can be used to create stable computations of `@Stable` fields. Only one updater is needed per class, similar to `AtomicIntegerFieldUpdater`.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix raw long updater under 32-bit mode

src/java.base/share/classes/java/net/URI.java line 558:

> 556: 
> 557:     // Used reflectively by HASH_UPDATER
> 558:     @Stable

What are the effect of this change on startup time? I remember that @cl4es made a number of changes to URI to improve startup. Maybe this change should be dropped out of this PR for now.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25040#discussion_r2075743220