RFR: 8291600: [vectorapi] vector cast op check is not always needed for vector mask cast [v7]

[Xiaohong Gong]

On Thu, 15 Sep 2022 08:36:02 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Hi, I'd like the add the assertion in the unify patch instead of this. So I will revert this change here. Thanks!
>
> Yes, assert (!is_mask || (is_mask && num_elem_from == num_elem_to),  "mask cast needs the same elem num ").

Looks good. Thanks!

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PR: https://git.openjdk.org/jdk/pull/9737