RFR: 8323779: Serial: Remove Generation::promotion_attempt_is_safe [v2]

[Albert Mingkun Yang]

On Tue, 16 Jan 2024 10:11:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple updating a field type to use more concrete type.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/17439#issuecomment-1895512737