Integrated: 8359119: Change Charset to use StableValue

[Per Minborg]

On Tue, 10 Jun 2025 14:09:03 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Fields and methods can better leverage the Stable Value API compared to using DCL and holder classes. There are also some fields that can be marked `@Stable`.
> 
> This PR passes tier1, tier2, and tier3 tests on multiple platforms.

This pull request has now been integrated.

Changeset: f364fcab
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f364fcab792ed5a14e5c2779fa85ecc9d6915ae3
Stats:     86 lines in 1 file changed: 26 ins; 30 del; 30 mod

8359119: Change Charset to use StableValue

Reviewed-by: alanb, rriggs

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PR: https://git.openjdk.org/jdk/pull/25727