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Address PR review comments
-  Thomas Stuefe Merge up to and including https://bugs.openjdk.org/browse/JDK-8340184
 
-  Thomas Stuefe Fix runtime/CompressedOops/CompressedClassPointersEncodingScheme.java (linux aarc
-  Fix: (likely all the same issues)
 jdk/jfr/event/gc/objectcount/TestObjectCountAfterGCEventWithG1ConcurrentMark.java
 jdk/jfr/event/gc/objectcount/TestObjectCountAfterGCEventWithG1FullCollection.java
 jdk/jfr/event/gc/objectcount/TestObjectCountAfterGCEventWithParallelOld.java
 jdk/jfr/event/gc/objectcount/TestObjectCountAfterGCEventWithSerial.java
 jdk/jfr/event/gc/objectcount/TestObjectCountEvent.java