Use compile type to improve stores to Int32List and Uint32List on ia32.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, 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 243 matching lines @@
   CompileType* Type();
 
   void SetReachingType(CompileType* type) {
     reaching_type_ = type;
   }
 
   void PrintTo(BufferFormatter* f) const;
 
   const char* DebugName() const { return "Value"; }
 
+  bool IsSmiValue() { return Type()->ToCid() == kSmiCid; }
+
   // Return true if the value represents a constant.
   bool BindsToConstant() const;
 
   // Return true if the value represents the constant null.
   bool BindsToConstantNull() const;
 
   // Assert if BindsToConstant() is false, otherwise returns the constant value.
   const Object& BoundConstant() const;
 
   // Compile time constants, Bool, Smi and Nulls do not need to update
@@ skipping 4181 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_