Release Note: Object Monitors No Longer Keep Strong References to Their Associated Object

When synchronization is performed on an object, an association is established between the object and the object monitor that implements the synchronization. In the past, the reference from a monitor to its associated object was a strong reference. These strong references would be observable through JVM TI functions that walk the heap (reported as `JVMTI_HEAP_ROOT_MONITOR` or `JVMTI_HEAP_REFERENCE_MONITOR`) and in heap dumps (reported as `HPROF_GC_ROOT_MONITOR_USED`). As of this release, a weak reference is used. These are not observable to JVM TI or heap dumps. Consequently, `JVMTI_HEAP_ROOT_MONITOR`, `JVMTI_HEAP_REFERENCE_MONITOR` and `HPROF_GC_ROOT_MONITOR_USED` are longer reported.