RFR: 8325897: Parallel: Remove PSYoungGen::is_maximal_no_gc

[Guoxiong Li]

Hi all,

This trivial patch removes the unnecessary method `PSYoungGen::is_maximal_no_gc`.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - JDK-8325897

Changes: https://git.openjdk.org/jdk/pull/18277/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18277&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325897
  Stats: 8 lines in 2 files changed: 1 ins; 4 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18277.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18277/head:pull/18277

PR: https://git.openjdk.org/jdk/pull/18277