--- a/src/hotspot/share/opto/loopopts.cpp	Fri Jan 26 13:13:19 2018 -0800
+++ b/src/hotspot/share/opto/loopopts.cpp	Tue Jan 30 09:08:44 2018 +0100
@@ -1036,7 +1036,7 @@
 
 
 bool PhaseIdealLoop::identical_backtoback_ifs(Node *n) {
-  if (!n->is_If()) {
+  if (!n->is_If() || n->is_CountedLoopEnd()) {
     return false;
   }
   if (!n->in(0)->is_Region()) {