--- old/src/share/vm/opto/loopUnswitch.cpp	2015-10-08 22:15:51.216219258 +0200
+++ new/src/share/vm/opto/loopUnswitch.cpp	2015-10-08 22:15:51.166220452 +0200
@@ -180,6 +180,7 @@
     ProjNode* invar_proj = invar_iff->proj_out(proj->_con)->as_Proj();
     while (worklist.size() > 0) {
       Node* use = worklist.pop();
+      assert(use->Opcode() != Op_ShenandoahWriteBarrier, "not with wbs yet");
       Node* nuse = use->clone();
       nuse->set_req(0, invar_proj);
       _igvn.replace_input_of(use, 1, nuse);