RFR: 8290376: G1: Refactor G1MMUTracker::when_sec [v2]

[Albert Mingkun Yang]

On Mon, 22 Aug 2022 20:11:29 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Introducing a more intuitive implementation.
>> 
>> This PR consists of two commits: the first adds the new algorithm and verifies the result is same as before. The second commit removes the old implementation.
>> 
>> Test: tier1-6 for the first commit.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/9517