RFR: 8374151: Cleanup minor markWord function disorder [v3]

[Stefan Karlsson]

> I propose a minor restructuring to have the hash, monitor, and displaced_marker_helper functions grouped instead of intermixed.

Stefan Karlsson 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 remote-tracking branch 'upstream/master' into 8374151_markword_discorder
 - 8374151: Cleanup minor markWord function disorder
 - 8374145: Remove legacy locking remnants from markWord

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28928/files
  - new: https://git.openjdk.org/jdk/pull/28928/files/21a499b1..70c9d633

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28928&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28928&range=01-02

  Stats: 2521 lines in 122 files changed: 1397 ins; 479 del; 645 mod
  Patch: https://git.openjdk.org/jdk/pull/28928.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28928/head:pull/28928

PR: https://git.openjdk.org/jdk/pull/28928