hg: zgc/zgc: 4 new changesets

[per.liden at oracle.com]

Changeset: 488e7eb83b3a
Author:    pliden
Date:      2018-12-10 11:12 +0100
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/488e7eb83b3a

ZGC: Fix ZIsUnloadingBehaviour::is_unloding() on zombie nmethod

! src/hotspot/share/gc/z/zUnload.cpp

Changeset: cbc4780e33b1
Author:    pliden
Date:      2018-12-10 12:03 +0100
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/cbc4780e33b1

ZGC: Add timer for class unloading

! src/hotspot/share/gc/z/zUnload.cpp

Changeset: 42b382e34015
Author:    pliden
Date:      2018-12-10 12:05 +0100
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/42b382e34015

ZGC: Clean up do_class_loader_data_graph()

! src/hotspot/share/gc/z/zRootsIterator.cpp

Changeset: b8fc4e34e377
Author:    pliden
Date:      2018-12-10 12:22 +0100
URL:       http://hg.openjdk.java.net/zgc/zgc/rev/b8fc4e34e377

ZGC: Swap immediate oops atomically

! src/hotspot/share/gc/z/zNMethodTable.cpp