RFR: 8348594: Shenandoah: Do not penalize for degeneration when not the fault of triggering heuristic

[William Kemper]

Trivial conflict. Has follow on issue.

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Commit messages:
 - 8350889: GenShen: Break out of infinite loop of old GC cycles
 - 8348594: Shenandoah: Do not penalize for degeneration when not the fault of triggering heuristic

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/165/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=165&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348594
  Stats: 84 lines in 12 files changed: 80 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/165.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/165/head:pull/165

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/165