8232112: MDO extra_data_lock leaks during class unloading
Summary: call the MDO destructor during class unloading.
Reviewed-by: dholmes, eosterlund
Welcome to the JDK!===================For information about building the JDK, including how to retrieve allof the source code, please see either of these files: * doc/building.html (html version) * doc/building.md (markdown version)See http://openjdk.java.net/ for more information about the OpenJDKCommunity and the JDK.