RFR: 8328112: Remove CardTable::_guard_region [v3]

[Albert Mingkun Yang]

On Fri, 15 Mar 2024 13:55:08 GMT, Guoxiong Li <gli at openjdk.org> wrote:

>> Hi all,
>> 
>> This patch removes the `CardTable::_guard_region`. Thanks for taking the time to review.
>> 
>> Best Regards,
>> -- Guoxiong
>
> Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Leave var  num_bytes.

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18324#pullrequestreview-1939060160