[turbofan] Next step towards shared operators.

src/compiler/graph-builder.h

Index: src/compiler/graph-builder.h
diff --git a/src/compiler/graph-builder.h b/src/compiler/graph-builder.h
index fb0431902c8ee61baa525e1e1c7fa0ab7b193460..c966c299b98265be53a59a46569892b11debe0be 100644
--- a/src/compiler/graph-builder.h
+++ b/src/compiler/graph-builder.h
@@ -24,40 +24,41 @@ class GraphBuilder {
   explicit GraphBuilder(Graph* graph) : graph_(graph) {}
   virtual ~GraphBuilder() {}
 
-  Node* NewNode(Operator* op) {
+  Node* NewNode(const Operator* op) {
     return MakeNode(op, 0, static_cast<Node**>(NULL));
   }
 
-  Node* NewNode(Operator* op, Node* n1) { return MakeNode(op, 1, &n1); }
+  Node* NewNode(const Operator* op, Node* n1) { return MakeNode(op, 1, &n1); }
 
-  Node* NewNode(Operator* op, Node* n1, Node* n2) {
+  Node* NewNode(const Operator* op, Node* n1, Node* n2) {
     Node* buffer[] = {n1, n2};
     return MakeNode(op, arraysize(buffer), buffer);
   }
 
-  Node* NewNode(Operator* op, Node* n1, Node* n2, Node* n3) {
+  Node* NewNode(const Operator* op, Node* n1, Node* n2, Node* n3) {
     Node* buffer[] = {n1, n2, n3};
     return MakeNode(op, arraysize(buffer), buffer);
   }
 
-  Node* NewNode(Operator* op, Node* n1, Node* n2, Node* n3, Node* n4) {
+  Node* NewNode(const Operator* op, Node* n1, Node* n2, Node* n3, Node* n4) {
     Node* buffer[] = {n1, n2, n3, n4};
     return MakeNode(op, arraysize(buffer), buffer);
   }
 
-  Node* NewNode(Operator* op, Node* n1, Node* n2, Node* n3, Node* n4,
+  Node* NewNode(const Operator* op, Node* n1, Node* n2, Node* n3, Node* n4,
                 Node* n5) {
     Node* buffer[] = {n1, n2, n3, n4, n5};
     return MakeNode(op, arraysize(buffer), buffer);
   }
 
-  Node* NewNode(Operator* op, Node* n1, Node* n2, Node* n3, Node* n4, Node* n5,
-                Node* n6) {
+  Node* NewNode(const Operator* op, Node* n1, Node* n2, Node* n3, Node* n4,
+                Node* n5, Node* n6) {
     Node* nodes[] = {n1, n2, n3, n4, n5, n6};
     return MakeNode(op, arraysize(nodes), nodes);
   }
 
-  Node* NewNode(Operator* op, int value_input_count, Node** value_inputs) {
+  Node* NewNode(const Operator* op, int value_input_count,
+                Node** value_inputs) {
     return MakeNode(op, value_input_count, value_inputs);
   }
 
@@ -65,7 +66,7 @@ class GraphBuilder {
 
  protected:
   // Base implementation used by all factory methods.
-  virtual Node* MakeNode(Operator* op, int value_input_count,
+  virtual Node* MakeNode(const Operator* op, int value_input_count,
                          Node** value_inputs) = 0;
 
  private:
@@ -107,8 +108,8 @@ class StructuredGraphBuilder : public GraphBuilder {
   // The following method creates a new node having the specified operator and
   // ensures effect and control dependencies are wired up. The dependencies
   // tracked by the environment might be mutated.
-  virtual Node* MakeNode(Operator* op, int value_input_count,
-                         Node** value_inputs);
+  virtual Node* MakeNode(const Operator* op, int value_input_count,
+                         Node** value_inputs) FINAL;
 
   Environment* environment() const { return environment_; }
   void set_environment(Environment* env) { environment_ = env; }