RFR: 8295149: Misnomer for_young_gc instead of for_young_only_phase in G1Analytics [v3]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that renames lots of `for_young_gc` parameters to `for_young_only_phase` to correspond to the actual meaning.
> 
> Depends on PR#10650, so please review that one first.
> 
> Testing: local compilation
> 
> Thanks,
>   Thomas

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

 - Merge branch 'pr/10650' of https://git.openjdk.org/jdk into submit/8295149-misnomer-for-young-gc
 - Merge branch 'master' into submit/8294850-gc-type-rs-length-predictor
 - Merge branch 'pr/10650' of https://git.openjdk.org/jdk into submit/8295149-misnomer-for-young-gc
 - ayang review
 - initial version
 - initial commit
 - initial version
 - initial version
 - initial version

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Changes: https://git.openjdk.org/jdk/pull/10651/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10651&range=02
  Stats: 100 lines in 7 files changed: 30 ins; 6 del; 64 mod
  Patch: https://git.openjdk.org/jdk/pull/10651.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10651/head:pull/10651

PR: https://git.openjdk.org/jdk/pull/10651