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

[Daniel D.Daugherty]

On Tue, 13 Oct 2020 20:31:16 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

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

This sub-task is tracking ObjectMonitor cleanup/minor bug-fix changes
extracted from Erik's and Dan's work on JDK-8253064. This extraction
is done to ease the code review for the JDK-8253064 changes.

My personal fork includes the commit for:
JDK-8254335: logging/logStream.hpp includes memory/resourceArea.hpp but d…
because the project is currently based on jdk-16+19 and I pushed that commit for jdk-16+20.
Please ignore that commit when reviewing this fix.

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