[jdk23u] RFR: 8334147: Shenandoah: Avoid taking lock for disabled free set logging

[William Kemper]

Clean backport.

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Commit messages:
 - 8334147: Shenandoah: Avoid taking lock for disabled free set logging

Changes: https://git.openjdk.org/jdk23u/pull/129/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=129&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334147
  Stats: 33 lines in 4 files changed: 14 ins; 9 del; 10 mod
  Patch: https://git.openjdk.org/jdk23u/pull/129.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/129/head:pull/129

PR: https://git.openjdk.org/jdk23u/pull/129