[turbofan] Make Node::set_op safer via wrapper.

src/compiler/select-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/select-lowering.h"
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/diamond.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
+#include "src/compiler/node-properties.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 SelectLowering::SelectLowering(Graph* graph, CommonOperatorBuilder* common)
     : common_(common),
       graph_(graph),
       merges_(Merges::key_compare(), Merges::allocator_type(graph->zone())) {}
 
@@ skipping 23 matching lines @@
 
     // If the diamond is reachable from the Select, merging them would result in
     // an unschedulable graph, so we cannot reuse the diamond in that case.
     merge = i->second;
     if (!ReachableFrom(merge, node)) {
       break;
     }
   }
 
   // Create a Phi hanging off the previously determined merge.
-  node->set_op(common()->Phi(p.type(), 2));
+  NodeProperties::ChangeOp(node, common()->Phi(p.type(), 2));
   node->ReplaceInput(0, vthen);
   node->ReplaceInput(1, velse);
   node->ReplaceInput(2, merge);
   return Changed(node);
 }
 
 
 bool SelectLowering::ReachableFrom(Node* const sink, Node* const source) {
   // TODO(turbofan): This is probably horribly expensive, and it should be moved
   // into node.h or somewhere else?!
@@ skipping 12 matching lines @@
         visited[input->id()] = true;
       }
     }
   }
   return false;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8