RFR: 8302590: Add String.indexOf(int ch, int fromIndex, int toIndex) [v2]

[Roger Riggs]

On Fri, 24 Feb 2023 17:45:42 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> addressed
>
> JMH does not indicate any performance regression.
> 
> W.r.t. renaming Java parameters in `@IntrinsicCandidate` methods, I crosschecked with a runtime compiler guy. He confirms that changing names in the Java implementations is irrelevant for the intrinsified code. There might be references to the names in native comments, but this is not the case for `indexOf`. However, to be on the safe side I reverted those renames back to the original.

Thanks for confirming

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