RFR: 8351344: Avoid explicit Objects.requireNonNull in String.join

[Roger Riggs]

On Thu, 20 Feb 2025 09:30:02 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> We have helpful NPE messages now - they are more user-friendly.
> And shorter methods are more likely to be inlined.

To confirm your intuition, please show the before/after performance differences if any.

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PR Comment: https://git.openjdk.org/jdk/pull/23710#issuecomment-2704887884