RFR: 8322097: Serial: Refactor CardTableRS::find_first_clean_card

Thu Dec 14 15:56:45 UTC 2023

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

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Commit messages:
 - s1-dirty

Changes: https://git.openjdk.org/jdk/pull/17110/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17110&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322097
  Stats: 35 lines in 2 files changed: 4 ins; 19 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/17110.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17110/head:pull/17110

PR: https://git.openjdk.org/jdk/pull/17110