RFR: 8291600: [vectorapi] vector cast op check is not always needed for vector mask cast [v3]

[Jie Fu]

On Thu, 25 Aug 2022 07:08:31 GMT, Quan Anh Mai <duke at openjdk.org> wrote:

> I think the general cases should come before the particular ones. These 2 rules are for a corner case where float or double masks with 256-bit width are involved. Thanks.

For modern x86 platforms, UseAVX would be >= 2, these 2 rules can be filtered out as soon as possible if we test  `UseAVX == 1` at the beginning.

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