RFR: 8348301: Remove unused Reference.waitForReferenceProcessing break-ins in tests

[Aleksey Shipilev]

On Thu, 23 Jan 2025 10:54:23 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> So the test wasn't actually calling Reference::waitForReferenceProcessing, do I have this right? In that case, this PR looks fine.

Yup. The last use of `Reference::waitForReferenceProcessing` was removed by [JDK-8080225](https://bugs.openjdk.org/browse/JDK-8080225)

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PR Comment: https://git.openjdk.org/jdk/pull/23239#issuecomment-2609512846