RFR: 8302590: Add String.indexOf(int ch, int fromIndex, int toIndex)

[Raffaello Giulietti]

On Thu, 16 Feb 2023 17:16:35 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Add an `indexOf()` variant allowing to specify both a lower and an upper bound on the search.

The underlying functionality is already present in non-publicly accessible methods. These are intrinsified, leveraging SIMD instructions where available.

This PR proposed to add a public API point to the underlying methods.

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PR: https://git.openjdk.org/jdk/pull/12600