RFR: 8351623: VectorAPI: Add SVE implementation of subword gather load operation

[Fei Gao]

On Mon, 14 Jul 2025 10:10:47 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Hi @Bhavana-Kilambi, @fg1417, could you please help take a look at this PR?  BTW, since the vector register size of my SVE machine is 128-bit, could you please help test the correctness on a SVE machine with larger vector size (e.g. 512-bit vector size)? Thanks a lot in advance!
>
>> Hi @XiaohongGong , thank you for doing this. As for testing, we can currently only test on 256-bit SVE machines (we no longer have any 512bit machines). We will get back to you with the results soon.
> 
> Testing on 256-bit SVE machines are fine to me. Thanks so much for your help!

@XiaohongGong thanks for your work! Tier1 - tier3 passed on `256-bit sve` machine without new failures.

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PR Comment: https://git.openjdk.org/jdk/pull/26236#issuecomment-3074114305