--- a/src/hotspot/share/opto/reg_split.cpp	Fri Jul 13 11:21:55 2018 +0800
+++ b/src/hotspot/share/opto/reg_split.cpp	Thu Jul 12 16:31:28 2018 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -683,7 +683,7 @@
         if( needs_phi ) {
           // create a new phi node and insert it into the block
           // type is taken from left over pointer to a predecessor
-          assert(n3,"No non-NULL reaching DEF for a Phi");
+          guarantee(n3, "No non-NULL reaching DEF for a Phi");
           phi = new PhiNode(b->head(), n3->bottom_type());
           // initialize the Reaches entry for this LRG
           Reachblock[slidx] = phi;