RFR: 8318801: Parallel: Remove unused verify_all_young_refs_precise

[Albert Mingkun Yang]

On Wed, 25 Oct 2023 08:27:04 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16355#issuecomment-1780881467