RFR: 8367292: VectorAPI: Optimize VectorMask.fromLong/toLong() for SVE [v6]

[Xiaohong Gong]

On Wed, 12 Nov 2025 06:42:15 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Internal tests pass (just sanity testing, did not run it on SVE). Code looks reasonable.
> 
> @XiaohongGong Thanks for all the updates and bearing with all the review comments 😊

Thanks for all your comments and testing. I also tested it with kinds of SVE environments locally.

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PR Comment: https://git.openjdk.org/jdk/pull/27481#issuecomment-3520467888