RFR: 8374151: Cleanup minor markWord function disorder

[Stefan Karlsson]

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

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Depends on: https://git.openjdk.org/jdk/pull/28927

Commit messages:
 - 8374151: Cleanup minor markWord function disorder

Changes: https://git.openjdk.org/jdk/pull/28928/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28928&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374151
  Stats: 25 lines in 1 file changed: 12 ins; 11 del; 2 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