RFR: 8325882: Serial: Move is_maximal_no_gc to TenuredGeneration

[Albert Mingkun Yang]

Trivial moving a method from superclass to subclass.

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Commit messages:
 - s1-expand

Changes: https://git.openjdk.org/jdk/pull/17850/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325882
  Stats: 17 lines in 4 files changed: 7 ins; 9 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17850.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17850/head:pull/17850

PR: https://git.openjdk.org/jdk/pull/17850