RFR: 8322097: Serial: Refactor CardTableRS::find_first_clean_card

[Ivan Walulya]

On Thu, 14 Dec 2023 15:50:38 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> The real change is only the `- 1` inside `byte_for`. Also some renaming to indicate the card belongs to the current obj.
> 
> Test: many iterations of the failing testcase in JDK-8321216

Marked as reviewed by iwalulya (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17110#pullrequestreview-1786869351