hg: shenandoah/jdk9/hotspot: Purge ealier version of redefined classes during class unloading

[zgu at redhat.com]

Changeset: e8a1e67bf431
Author:    zgu
Date:      2017-04-21 09:37 -0400
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/e8a1e67bf431

Purge ealier version of redefined classes during class unloading

! src/share/vm/gc/shenandoah/shenandoahHeap.cpp