RFR: 8325053: Serial: Move Generation::save_used_region to TenuredGeneration

Wed Jan 31 14:08:10 UTC 2024

Trivial moving a field and its accessors from superclass to subclass.

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Commit messages:
 - s1-save-used-region

Changes: https://git.openjdk.org/jdk/pull/17654/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17654&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325053
  Stats: 25 lines in 5 files changed: 5 ins; 17 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17654.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17654/head:pull/17654

PR: https://git.openjdk.org/jdk/pull/17654