RFR: 8332807: Parallel: Make some APIs in ParMarkBitMap private [v2]

[Albert Mingkun Yang]

> Trivial moving methods from public to private.

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 one additional commit since the last revision:

  pgc-api

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19360/files
  - new: https://git.openjdk.org/jdk/pull/19360/files/20c1ee97..9294c757

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19360&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19360&range=00-01

  Stats: 1891 lines in 41 files changed: 1216 ins; 573 del; 102 mod
  Patch: https://git.openjdk.org/jdk/pull/19360.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19360/head:pull/19360

PR: https://git.openjdk.org/jdk/pull/19360