RFR: 8335607: Serial: Remove unused collection_attempt_is_safe

[Albert Mingkun Yang]

On Wed, 3 Jul 2024 09:58:20 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/20001#issuecomment-2206016070