RFR: 8318908: Parallel: Remove ExtendedCardValue

Thu Oct 26 15:10:42 UTC 2023

Simple removing some dead code; after this, a card is either clean or dirty.

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Commit messages:
 - pgc-trim-card-enum

Changes: https://git.openjdk.org/jdk/pull/16380/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16380&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318908
  Stats: 37 lines in 2 files changed: 0 ins; 35 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16380.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16380/head:pull/16380

PR: https://git.openjdk.org/jdk/pull/16380