RFR: 8351443: Improve robustness of StringBuilder [v5]

[Jaikiran Pai]

On Mon, 5 May 2025 17:58:09 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> In fact, `StringUTF16` and `StringLatin1` are both package-private, so technically all their method access modifiers should either be package-private or private.
>
> How about in another PR.  None of the `public static ` methods in StringUTF16 or StringLatin1 need to be public. But it will make this PR very noisy for the wrong reasons.

Doing that in a separate issue/PR sounds good to me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24967#discussion_r2073921127