RFR: 8292912: Make guard card in CardTable inaccessible [v2]

[Albert Mingkun Yang]

On Mon, 5 Sep 2022 13:47:53 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of making the guard card inaccessible.
>> 
>> Test: tier1-6
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/10020