RFR: 8280419: Remove dead code related to VerifyThread and verify_thread() [v2]

[David Holmes]

On Thu, 16 Feb 2023 07:55:54 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> GHAs are not there though.

@tstuefe , sorry the GHA was a manual run:

https://github.com/dholmes-ora/jdk/actions/runs/4140195206

Thanks for the reviews @tstuefe  and @RealLucy !

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PR: https://git.openjdk.org/jdk/pull/12506