RFR: 8373714: Shenandoah: Register heuristic penalties following a degenerated GC

[Kelvin Nilsen]

Add a triggering penalty when we execute degenerated GC cycle.

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Commit messages:
 - remove redundant code
 - Increase heuristic penalties following degenerated GC

Changes: https://git.openjdk.org/jdk/pull/28834/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373714
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28834.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28834/head:pull/28834

PR: https://git.openjdk.org/jdk/pull/28834