hg: shenandoah/jdk8u/hotspot: [backport] Purge ealier version of redefined classes during class unloading

[ashipile at redhat.com]

Changeset: 3b94577c3a35
Author:    shade
Date:      2017-05-09 14:17 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/3b94577c3a35

[backport] Purge ealier version of redefined classes during class unloading

! src/share/vm/gc_implementation/shenandoah/shenandoahConcurrentMark.cpp