RFR: 8358768: [vectorapi] Make VectorOperators.SUADD an Associative [v4]

[Quan Anh Mai]

On Mon, 14 Jul 2025 21:43:58 GMT, Ian Graves <igraves at openjdk.org> wrote:

>> Adding SUADD an associative operation in the Vector API. Saturated addition on fixed-width unsigned integers is provably associative.
>
> Ian Graves has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Condensing test data

I believe this is inadequate, an `Associative` will allow reduction operation. You need to add support for `SUADD` to that, too.

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PR Comment: https://git.openjdk.org/jdk/pull/26099#issuecomment-3074198480