RFR: 8267969: Add vectorized implementation for VectorMask.eq()

[Xiaohong Gong]

On Tue, 1 Jun 2021 16:29:58 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Looks. Later we may want to consider pushing this down as an intrinsic, perhaps reusing `VectorSupport.compare`.

Thanks for your review @PaulSandoz ! Yes, reusing `VectorSupport.compare` is an alternative way to do the vectorization.

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PR: https://git.openjdk.java.net/jdk/pull/4272