RFR: 8318647: Serial: Refactor BlockOffsetTable [v3]

[Albert Mingkun Yang]

On Wed, 25 Oct 2023 14:01:55 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> The diff is too large; maybe it's better to read the new impl directly, which I believe is much easier to follow.
>> 
>> There is some duplication with G1's implementation, which should probably be dealt with in its own PR.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Renamed class and `u_char`. Split into their own commits for easier reviewing.

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PR Comment: https://git.openjdk.org/jdk/pull/16304#issuecomment-1784938755