RFR: 8331557: Serial: Refactor SerialHeap::do_collection [v6]

[Albert Mingkun Yang]

> It's probably easier to read the new code directly. The two classes in `serialVMOperations` serve as entrance points to invoke young/full GCs. Some previously hidden decisions are made more obvious, e.g. if a young-gc fails (or will probablly fail), fallback to full-gc.
> 
> Additionally, `StatRecord` is removed, because this kind of info-aggregation should be done outsite VM (by third-party tool).
> 
> Test: tier1-6

Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into s1-do-collect
 - review
 - Merge branch 'master' into s1-do-collect
 - merge
 - review
 - Merge branch 'master' into s1-do-collect
 - s1-do-collect

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Changes: https://git.openjdk.org/jdk/pull/19056/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19056&range=05
  Stats: 566 lines in 15 files changed: 125 ins; 356 del; 85 mod
  Patch: https://git.openjdk.org/jdk/pull/19056.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19056/head:pull/19056

PR: https://git.openjdk.org/jdk/pull/19056