Add range information to external array loads.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3798 matching lines @@
     // for the element load is a naked pointer.
     return index == 0
       ? Representation::External()
       : Representation::Integer32();
   }
 
   HValue* external_pointer() { return OperandAt(0); }
   HValue* key() { return OperandAt(1); }
   ElementsKind elements_kind() const { return elements_kind_; }
 
+  virtual Range* InferRange();
+
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyedSpecializedArrayElement)
 
  protected:
   virtual bool DataEquals(HValue* other) {
     if (!other->IsLoadKeyedSpecializedArrayElement()) return false;
     HLoadKeyedSpecializedArrayElement* cast_other =
         HLoadKeyedSpecializedArrayElement::cast(other);
     return elements_kind_ == cast_other->elements_kind();
   }
 
@@ skipping 694 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_