--- old/src/share/vm/opto/matcher.cpp	2017-05-18 15:08:08.701307485 +0200
+++ new/src/share/vm/opto/matcher.cpp	2017-05-18 15:08:08.621307489 +0200
@@ -1645,6 +1645,7 @@
 
   // Build the object to represent this state & prepare for recursive calls
   MachNode *mach = s->MachNodeGenerator(rule);
+  guarantee(mach != NULL, "Missing MachNode");
   mach->_opnds[0] = s->MachOperGenerator(_reduceOp[rule]);
   assert( mach->_opnds[0] != NULL, "Missing result operand" );
   Node *leaf = s->_leaf;