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

[Xiaohong Gong]

On Fri, 21 Oct 2022 03:55:50 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Hi all,
> 
> Many vector api tests fail on x86_32 after JDK-8293409 due to computing incorrect results.
> The reason is that `generate_iota_indices` was updated only for x86_64 in JDK-8293409.
> So let's fix it for x86_32.
> 
> Testing:
>   - vector api tests on x86_32, all passed
> 
> Thanks.
> Best regards,
> Jie

Marked as reviewed by xgong (Committer).

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