RFR: 8322296: Introduce CardWord for word iteration on CardTable

Mon Dec 18 14:20:45 UTC 2023

Simple adding a new type for card-word in `CardTable` in order to avoid repeating the same logic/typedef in card based collectors.

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Commit messages:
 - card-word

Changes: https://git.openjdk.org/jdk/pull/17144/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17144&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322296
  Stats: 30 lines in 3 files changed: 5 ins; 7 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/17144.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17144/head:pull/17144

PR: https://git.openjdk.org/jdk/pull/17144