diff -r 2c666a83fd1f -r 82848b0654f8 hotspot/src/share/vm/opto/memnode.cpp
--- a/hotspot/src/share/vm/opto/memnode.cpp	Mon Aug 22 20:30:37 2016 +0000
+++ b/hotspot/src/share/vm/opto/memnode.cpp	Tue Aug 23 13:44:26 2016 +0200
@@ -1112,7 +1112,7 @@
     for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
       Node* phi = region->fast_out(i);
       if (phi->is_Phi() && phi != mem &&
-          phi->as_Phi()->is_same_inst_field(this_type, this_iid, this_index, this_offset)) {
+          phi->as_Phi()->is_same_inst_field(this_type, (int)mem->_idx, this_iid, this_index, this_offset)) {
         return phi;
       }
     }
@@ -1395,7 +1395,7 @@
     this_iid = base->_idx;
   }
   PhaseIterGVN* igvn = phase->is_IterGVN();
-  Node* phi = new PhiNode(region, this_type, NULL, this_iid, this_index, this_offset);
+  Node* phi = new PhiNode(region, this_type, NULL, mem->_idx, this_iid, this_index, this_offset);
   for (uint i = 1; i < region->req(); i++) {
     Node* x;
     Node* the_clone = NULL;