RFR: 8367292: VectorAPI: Optimize VectorMask.fromLong/toLong() for SVE [v3]

[erifan]

On Fri, 24 Oct 2025 09:01:35 GMT, erifan <duke at openjdk.org> wrote:

>> I don't know where there is such a comment, if no, maybe this function is a good place to comment this.
>> 
>> Also I wonder if it's better to return an enum constant? For example:
>> 
>> PREDICATE_MASK
>> PACKED_MASK
>> UNPACKED_MASK
>
> By the way, I'm fine to the current implementation. Thanks

Both `prefer` and `use` look good to me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27481#discussion_r2459438526