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

[Guoxiong Li]

On Fri, 15 Mar 2024 20:10:26 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Does the comment `each card takes 1 byte` need to be adjusted?
>
> just remove it imo. The code makes it clear that we calculate cards * sizeof(card) here.

Fixed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18324#discussion_r1527513494