RFR: 8371792: Refactor barrier loop tests out of TestIfMinMax [v2]

[Christian Hagedorn]

On Fri, 21 Nov 2025 12:53:00 GMT, Galder Zamarreño <galder at openjdk.org> wrote:

>> Trivial cleanup to move tests out of a test class whose description does not match these tests
>
> Galder Zamarreño has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change copyright to Amazon

Marked as reviewed by chagedorn (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28385#pullrequestreview-3499294028