RFR: 8254029: ObjectMonitor cleanup/minor bug-fix changes extracted from JDK-8253064

[Daniel D.Daugherty]

8254029: ObjectMonitor cleanup/minor bug-fix changes extracted from JDK-8253064

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Commit messages:
 - 8253064.v00.part0
 - 8254335: logging/logStream.hpp includes memory/resourceArea.hpp but doesn't need it

Changes: https://git.openjdk.java.net/jdk/pull/641/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=641&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254029
  Stats: 178 lines in 19 files changed: 58 ins; 38 del; 82 mod
  Patch: https://git.openjdk.java.net/jdk/pull/641.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/641/head:pull/641

PR: https://git.openjdk.java.net/jdk/pull/641