Ensure that outgoing constant arguments will be materialized.

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/growable_array.h"
 #include "vm/handles_impl.h"
@@ skipping 24 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Computation);
 };
 
 
 class Value : public Computation {
  public:
   Value() { }
 
+  virtual bool IsConstant() const { return false; }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(Value);
 };
 
 
 class AssertAssignableComp : public Computation {
  public:
   AssertAssignableComp(Value* value, const AbstractType& type)
       : value_(value), type_(type) { }
 
@@ skipping 77 matching lines @@
   intptr_t index_;
 
   DISALLOW_COPY_AND_ASSIGN(TempValue);
 };
 
 
 class ConstantValue: public Value {
  public:
   explicit ConstantValue(const Instance& instance) : instance_(instance) { }
 
+  virtual bool IsConstant() const { return true; }
+
   virtual void Print() const;
 
  private:
   const Instance& instance_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstantValue);
 };
 
 
 // Instructions.
@@ skipping 236 matching lines @@
 #undef DECLARE_VISIT
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstructionVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_