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

[Jatin Bhateja]

On Thu, 15 Sep 2022 08:35:58 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Something like: `assert(!is_mask, "mask cast needs the same elem num ")`
>
> 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 ").

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