Enable CSE for binary smi ops and constants.

runtime/vm/intermediate_language.h

 // 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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 1453 matching lines @@
 
   const Object& value() const { return value_; }
 
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   virtual bool CanDeoptimize() const { return false; }
 
   virtual intptr_t ResultCid() const;
 
   virtual bool AttributesEqual(Definition* other) const;
+  virtual bool AffectedBySideEffect() const { return false; }
 
  private:
   const Object& value_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstantInstr);
 };
 
 
 class AssertAssignableInstr : public TemplateDefinition<3> {
  public:
@@ skipping 1495 matching lines @@
 
   const ICData* ic_data() const { return instance_call()->ic_data(); }
 
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   DECLARE_INSTRUCTION(BinarySmiOp)
   virtual RawAbstractType* CompileType() const;
 
   virtual bool CanDeoptimize() const;
 
+  virtual bool AttributesEqual(Definition* other) const;
+  virtual bool AffectedBySideEffect() const { return false; }
+
   virtual intptr_t ResultCid() const;
 
  private:
   const Token::Kind op_kind_;
   InstanceCallInstr* instance_call_;
 
   DISALLOW_COPY_AND_ASSIGN(BinarySmiOpInstr);
 };
 
 
@@ skipping 445 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_