hg: jdk/sandbox: 8213107: Make ClassLoaderDataGraph iterator skip unloaded CLDs

[chris.hegarty at oracle.com]

Changeset: 55711b181dfc
Author:    coleenp
Date:      2018-10-31 07:06 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/55711b181dfc

8213107: Make ClassLoaderDataGraph iterator skip unloaded CLDs
Summary: with concurrent class unloading, the CLDG could contain unloaded CLDs while iterating in a safepoint
Reviewed-by: lfoltan, eosterlund

! src/hotspot/share/classfile/classLoaderDataGraph.cpp