hg: jdk9/hs/hotspot: 8164692: InstanceKlass::_previous_version_count goes negative

[coleen.phillimore at oracle.com]

Changeset: 47bb3faf5b08
Author:    coleenp
Date:      2016-08-31 06:35 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/47bb3faf5b08

8164692: InstanceKlass::_previous_version_count goes negative
Summary: decrement previous_version_count when it's removed from the list.
Reviewed-by: dcubed, dlong, sspitsyn

! src/share/vm/classfile/classLoaderData.cpp
! src/share/vm/oops/instanceKlass.cpp
! src/share/vm/oops/instanceKlass.hpp
+ test/runtime/RedefineTests/RedefineCount.java