RFR: 8373714: Shenandoah: Register heuristic penalties following a degenerated GC [v2]

[Kelvin Nilsen]

> Add a triggering penalty when we execute degenerated GC cycle.

Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:

  refactor for reviewer requests

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28834/files
  - new: https://git.openjdk.org/jdk/pull/28834/files/d67ca8e5..3f12ff15

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28834&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28834&range=00-01

  Stats: 28 lines in 7 files changed: 25 ins; 1 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