RFR: 8327057: Parallel: Refactor ParMarkBitMap::iterate [v2]

[Albert Mingkun Yang]

> Simplifying bitmap iterate logic in full-gc compaction to reduce possible outcomes callers must handle.
> 
> Test: tier1-6

Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into pgc-iterate-incomplete
 - review
 - pgc-iterate-incomplete

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18065/files
  - new: https://git.openjdk.org/jdk/pull/18065/files/fd271ce4..99683352

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18065&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18065&range=00-01

  Stats: 484 lines in 37 files changed: 270 ins; 58 del; 156 mod
  Patch: https://git.openjdk.org/jdk/pull/18065.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18065/head:pull/18065

PR: https://git.openjdk.org/jdk/pull/18065