RFR: 8314329: AgeTable: add is_clear() & allocation spec, and relax assert to allow use of 0-index slot [v2]

[Y. Srinivas Ramakrishna]

On Fri, 19 Jan 2024 00:43:19 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Y. Srinivas Ramakrishna has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Code review from earthling-amzn: Early return.
>
> Marked as reviewed by wkemper (Author).

Thanks @earthling-amzn & @kdnilsen!

Could I please also have one of the G1 folk look over this and approve as a formal [Reviewer](https://openjdk.org/bylaws#reviewer), so I can  push the change; may be @tschatzl or @stefank or @albertnetymk et al. Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/17470#issuecomment-1899458744