Integrated: 8354300: Mark String.hash field @Stable

[Per Minborg]

On Mon, 14 Apr 2025 14:47:59 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to add the `@Stable` annotation to `j.l.String.hash` and `j.l.String.hashIsZero`. This means the VM can trust these fields to never change which enables constant folding optimizations.
> 
> This PR is tested in tier1, tier2, tier3, and tier4 which all pass.

This pull request has now been integrated.

Changeset: 072b8273
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/072b8273a4c7bd75bce440e5f1184e2926ed0f78
Stats:     98 lines in 2 files changed: 96 ins; 0 del; 2 mod

8354300: Mark String.hash field @Stable

Reviewed-by: liach, shade, vlivanov

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PR: https://git.openjdk.org/jdk/pull/24625