Merge

8139651: ConcurrentG1Refine uses ints for many of its members that should be unsigned types Summary: ints need to be changed to size_t Reviewed-by: kbarrett, tbenson

Merge

8150629: Initializing all ParScanThreadStates causes significant unaccounted "Other" times Summary: Lazily allocate ParScanThreadStates within the worker threads instead of doing this work upfront serially. Reviewed-by: mgerdin, jmasa

8150630: Add logging for ParScanThreadState merge phase Summary: Improve visibility of the per-thread scan state merge phase by adding appropriate logging. Reviewed-by: jmasa, tbenson

8076463: Add logging for the preserve CM referents task Summary: Add logging and do minor refactoring to CM referents handling task. Reviewed-by: jmasa

8140777: Make Adaptive IHOP logging information the same as JFR logging Reviewed-by: tbenson, jmasa