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

[Aleksey Shipilev]

On Wed, 22 Jan 2025 16:59:04 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> `Reference.waitForReferenceProcessing` is in internal API, which should go away with [JDK-8344332](https://bugs.openjdk.org/browse/JDK-8344332). There is single use of that internal API in the tests, the last use of which was removed by [JDK-8080225](https://bugs.openjdk.org/browse/JDK-8080225). We can remove the `Reference.waitForReferenceProcessing` break-ins in the tests now.
> 
> Additional testing:
>  - [x] Affected test still passes

All right, thanks. Added `noreg-self` to the bug.

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PR Comment: https://git.openjdk.org/jdk/pull/23239#issuecomment-2610399398