RFR: 8320448: Accelerate IndexOf using AVX2 [v48]

[Emanuel Peter]

On Thu, 30 May 2024 13:03:06 GMT, Scott Gibbons <sgibbons at openjdk.org> wrote:

>> Would be a shame to spend so much time on writing a test and then not apply it everywhere ;)
>
> I'll add a separate @test block to this file.  It was, however, written specifically tuned for the new algorithm to exercise known edge cases.

A new `@test` sounds like a good idea

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PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1620747402