First step toward an optimizing compiler:

runtime/vm/flow_graph_optimizer.h

Index: runtime/vm/flow_graph_optimizer.h
===================================================================
--- runtime/vm/flow_graph_optimizer.h	(revision 0)
+++ runtime/vm/flow_graph_optimizer.h	(revision 0)
@@ -0,0 +1,35 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_FLOW_GRAPH_OPTIMIZER_H_
+#define VM_FLOW_GRAPH_OPTIMIZER_H_
+
+#include "vm/intermediate_language.h"
+
+namespace dart {
+
+template <typename T> class GrowableArray;
+
+class FlowGraphOptimizer : public FlowGraphVisitor {
+ public:
+  explicit FlowGraphOptimizer(const GrowableArray<BlockEntryInstr*>& blocks)
+      : FlowGraphVisitor(blocks) {}
+  virtual ~FlowGraphOptimizer() {}
+
+  void ApplyICData();
+
+  virtual void VisitInstanceCall(InstanceCallComp* comp);
+
+  virtual void VisitDo(DoInstr* instr);
+  virtual void VisitBind(BindInstr* instr);
+
+ private:
+  void VisitBlocks();
+
+  DISALLOW_COPY_AND_ASSIGN(FlowGraphOptimizer);
+};
+
+}  // namespace dart
+
+#endif  // VM_FLOW_GRAPH_OPTIMIZER_H_