RFR: 8292898: [vectorapi] Unify vector mask cast operation [v4]

[Quan Anh Mai]

On Tue, 27 Sep 2022 04:02:42 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> UseAVX > 2 signifies AVX512 target where carrier of all currently valid mask IR nodes is an opmask register.
>
> I see, thanks! I will change this later.

For AVX3, a mask register is used if the vector species is 512-bit wide or the machine supports AVX512VL, so this code is still relevant in this case.

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PR: https://git.openjdk.org/jdk/pull/10192