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

[Kelvin Nilsen]

On Wed, 7 Jan 2026 17:35:49 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> @kdnilsen , what do you think about having a single method called `record_degenerated`. It's a matter of fact without conflating progress and success. I don't like having duplicated code between `record_success_degenerated` and `record_unsuccessful_degenerated`. I understand what @ysramakrishna is saying, and I agree, but I think a change like that is beyond the scope of this PR.
>
> I like this idea.  I'll try to make that work without breaking anything...

I've committed this change and it is running through the CI pipeline.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28834#discussion_r2669739585