RFR: 8295762: [Vector API] Update generate_iota_indices for x86_32 after JDK-8293409

[Jie Fu]

On Fri, 21 Oct 2022 05:20:34 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> > How about adding the vector api tests in GHA in a separate PR?
> 
> Yes, it is definitely separate changes.

Thanks @vnkozlov .
Will do it next week.

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PR: https://git.openjdk.org/jdk/pull/10807