[vectorIntrinsics+mask] RFR: 8273264: AArch64: [vector] Add missing rules for VectorMaskCast [v4]

[Paul Sandoz]

On Fri, 17 Sep 2021 07:38:28 GMT, Eric Liu <eliu at openjdk.org> wrote:

>> This patch
>> 1. Adds missing rules for VectorMaskCast for compatible species, E.g.
>>    ByteVector.SPECIES_64 --> ShortVector.SPECIES_128
>> 2. Fixes a matching failure on AArch64.
>> 
>> The performance improves about 60% compared with the unintrinsified
>> version.
>
> Eric Liu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix comment
>   
>   Change-Id: I01670a0e4a8df4f3a9a62b779ca5659863ec05d9

Comment in test looks good.

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Marked as reviewed by psandoz (Committer).

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