RFR: 8294850: Make rs length/pending card predictors dependent on gc phase [v3]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this change that separates `rs_length` and `pending_cards` predictors by young phase?
> 
> Some notes:
> * this does not intend to improve the predictors themselves - i.e. the use of `xxx_diff` and `xxx` predictors and adding them together is kind of weird, imho trying to add a kind of prediction compensation/improvement to act on differences like a (PID-)controller. I also strongly suspect that the `xxx_diff` predictors ought to be allowed to report negative values. This is no attempt to fix this
> * the parameter `for_young_gc` in the analytics API is misnamed. It's not about young gcs, but young_only_phase - I will fix this in a follow-up
> 
> Depends on PR#10649, please review that one first.
> 
> Thanks, 
>   Thomas
> 
> Testing: gha, local testing, tier1-5 with other changes in this patch series, perf testing with other changes in this patch series

Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge branch 'master' into submit/8294850-gc-type-rs-length-predictor
 - ayang review
 - initial commit
 - initial version
 - initial version
 - initial version

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Changes: https://git.openjdk.org/jdk/pull/10650/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10650&range=02
  Stats: 71 lines in 3 files changed: 30 ins; 6 del; 35 mod
  Patch: https://git.openjdk.org/jdk/pull/10650.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10650/head:pull/10650

PR: https://git.openjdk.org/jdk/pull/10650