RFR: 8364007: Add no-argument codePointCount method to CharSequence and String [v14]

[Tatsunori Uchino]

On Thu, 29 Jan 2026 23:29:40 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Bonus if you could rename each testX to testMethodName

"`testCodePointCount`" has already been occupied:

https://github.com/tats-u/jdk/blob/585ce36e125ec2f79483311512d8789ff39b0df9/test/jdk/java/lang/StringBuilder/Supplementary.java#L365-L376

https://github.com/tats-u/jdk/blob/585ce36e125ec2f79483311512d8789ff39b0df9/test/jdk/java/lang/StringBuilder/Supplementary.java#L247-L251

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PR Review Comment: https://git.openjdk.org/jdk/pull/26461#discussion_r2746778790