RFR: 8255174: Vector API unit tests for missed public api code coverage

[Paul Sandoz]

On Wed, 21 Oct 2020 20:17:32 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> Additional tests to increase Vector API public method code coverage to > 99%.

I already reviewed these test updates when integrated into the `vectorIntrinsics` branch of the `panama-vector` repository.

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Marked as reviewed by psandoz (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/785