RFR: 8325053: Serial: Move Generation::save_used_region to TenuredGeneration [v3]

[Albert Mingkun Yang]

On Wed, 31 Jan 2024 15:50:18 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Trivial moving a field and its accessors from superclass to subclass.
>
> 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/17654#issuecomment-1921057877