hg: jdk/sandbox: 8232112: MDO extra_data_lock leaks during class unloading

[chris.hegarty at oracle.com]

Changeset: eda750f21308
Author:    coleenp
Date:      2019-10-17 07:35 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/eda750f21308

8232112: MDO extra_data_lock leaks during class unloading
Summary: call the MDO destructor during class unloading.
Reviewed-by: dholmes, eosterlund

! src/hotspot/share/oops/instanceKlass.cpp
! src/hotspot/share/oops/method.cpp
! src/hotspot/share/oops/method.hpp
! src/hotspot/share/oops/methodData.hpp