8371792: Refactor barrier loop tests out of TestIfMinMax

[galderz]

Trivial cleanup to move tests out of a test class whose description does not match these tests

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Progress

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Issue

• JDK-8371792: Refactor barrier loop tests out of TestIfMinMax (Enhancement - P4)

Reviewers

• Benoît Maillard (@benoitmaillard - Committer)

Reviewing

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[mlbridge]

Webrevs

• 00: Full (2ed8c4bf)

[benoitmaillard]

Looks good to me, thanks for making the change @galderz!

I have also submitted internal testing just in case.