RFR: 8359419: AArch64: Relax min vector length to 32-bit for short vectors [v4]

[Xiaohong Gong]

On Thu, 10 Jul 2025 01:40:06 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Thanks for making the changes. Looks good to me.
>
>> Thanks for making the changes. Looks good to me.
> 
> Thanks a lot for your review!

> @XiaohongGong The code changes look sane, although, for the record, I'm not that familiar with this part of HotSpot. Testing also looks good, details below.
> 
> ### Testing
> * [GitHub Actions](https://github.com/dlunde/jdk/actions/runs/16165935815)
> * `tier1` to `tier4` (and additional Oracle-internal testing) on Windows x64, Linux x64, Linux aarch64, macOS x64, and macOS aarch64.
> * Performance testing on DaCapo, Renaissance, SPECjbb, and SPECjvm on Linux x64 and macOS aarch64. No observable improvements nor regressions.

Great! Thanks a lot for your testing and review~

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PR Comment: https://git.openjdk.org/jdk/pull/26057#issuecomment-3059921607