RFR: 8314329: AgeTable: add is_clear() & allocation spec, and relax assert to allow use of 0-index slot [v4]

[Y. Srinivas Ramakrishna]

On Mon, 22 Jan 2024 16:09:45 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

>> I'd like to propose the following changes to the AgeTable (motivated by the uses in generational shenandoah):
>
> Y. Srinivas Ramakrishna has updated the pull request incrementally with one additional commit since the last revision:
> 
>   const-ed is_clear() method of AgeTable.

Thanks for your reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/17470#issuecomment-1904698421