RFR: 8269725: AArch64: Add VectorMask query implementation for NEON [v5]

[Andrew Haley]

On Wed, 14 Jul 2021 10:33:28 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Yes, actually they are not AAch64-specific. Besides AArch64, x86 also defines the same methods in `x86.ad` and they are used widely in there match rules.
>
> Since this change will touch the x86 codes, do you think it's better to create a followed-up patch to remove the shared methods?

Yes, let's do it later. But let's not forget.

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PR: https://git.openjdk.java.net/jdk/pull/4699