This is to get information about the pause time distribution (prepare(copy, sorting, …) , process (iterate) and cleanup) and region/objects/size statistics when processing evacuation failure objects in “Remove Self Forwards”, this information will be helpful when optimize the evacuation failure processing subsequently, and will also be helpful for users to analyze and troubleshoot in the future.

This is one of the follow-up tasks discussed at : 
 - https://github.com/openjdk/jdk/pull/6627#pullrequestreview-821445879, and 
 - https://github.com/openjdk/jdk/pull/6627#issuecomment-985478359