[vectorIntrinsics+mask] RFR: 8273264: AArch64: [vector] Add missing rules for VectorMaskCast [v3]

[Eric Liu]

On Thu, 16 Sep 2021 22:41:31 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> The reason maybe the same as https://bugs.openjdk.java.net/browse/JDK-8259610, but I didn't pay too much time in the details.
>
> Ok. I don't wanna block this PR. Could you add some comment to the test providing some rational as to why it is currently needed, making reference to the vector conversions tests, and that we need to eventually resolve such issues and avoid the duplication?

Yes, it's been added in the new commit. Thanks for your kindly review.

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PR: https://git.openjdk.java.net/panama-vector/pull/124