RFR: 8256581: Refactor vector conversion tests

[Vladimir Ivanov]

On Thu, 19 Nov 2020 01:07:12 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Refactor the vector conversions tests to improve performance and reduce explicit test methods (using data providers).

> +463, -37,019 

Impressive improvement, Paul! :-)

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Marked as reviewed by vlivanov (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1302