RFR: 8319620: Parallel: Remove unused PSPromotionManager::*_is_full getters and setters

[Thomas Schatzl]

Hello,

  please review this trivial removal of some unused member functions in `PSPromotionManager`.

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - 8319620-remove-is-full-getters

Changes: https://git.openjdk.org/jdk/pull/16539/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16539&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319620
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16539.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16539/head:pull/16539

PR: https://git.openjdk.org/jdk/pull/16539