Add dependency operand to HLoadNamedField.

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 6030 matching lines @@
 
   friend class HLoadNamedField;
   friend class HStoreNamedField;
 
   inline Portion portion() const {
     return PortionField::decode(value_);
   }
 };
 
 
-class HLoadNamedField V8_FINAL : public HTemplateInstruction<1> {
+class HLoadNamedField V8_FINAL : public HTemplateInstruction<2> {
  public:
-  DECLARE_INSTRUCTION_FACTORY_P2(HLoadNamedField, HValue*, HObjectAccess);
+  DECLARE_INSTRUCTION_FACTORY_P3(HLoadNamedField, HValue*, HValue*,
+                                 HObjectAccess);
 
   HValue* object() { return OperandAt(0); }
-  bool HasTypeCheck() { return object()->IsCheckMaps(); }
+  HValue* dependency() {
+    ASSERT(HasDependency());
+    return OperandAt(1);
+  }
+  bool HasDependency() const { return OperandAt(0) != OperandAt(1); }
   HObjectAccess access() const { return access_; }
   Representation field_representation() const {
       return access_.representation();
   }
 
   virtual bool HasEscapingOperandAt(int index) V8_OVERRIDE { return false; }
   virtual bool HasOutOfBoundsAccess(int size) V8_OVERRIDE {
     return !access().IsInobject() || access().offset() >= size;
   }
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
     if (index == 0 && access().IsExternalMemory()) {
       // object must be external in case of external memory access
       return Representation::External();
     }
     return Representation::Tagged();
   }
   virtual Range* InferRange(Zone* zone) V8_OVERRIDE;
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
   DECLARE_CONCRETE_INSTRUCTION(LoadNamedField)
 
  protected:
   virtual bool DataEquals(HValue* other) V8_OVERRIDE {
     HLoadNamedField* b = HLoadNamedField::cast(other);
     return access_.Equals(b->access_);
   }
 
  private:
-  HLoadNamedField(HValue* object, HObjectAccess access) : access_(access) {
+  HLoadNamedField(HValue* object,
+                  HValue* dependency,
+                  HObjectAccess access) : access_(access) {
     ASSERT(object != NULL);
     SetOperandAt(0, object);
+    SetOperandAt(1, dependency != NULL ? dependency : object);
 
     Representation representation = access.representation();
     if (representation.IsInteger8() ||
         representation.IsUInteger8() ||
         representation.IsInteger16() ||
         representation.IsUInteger16()) {
       set_representation(Representation::Integer32());
     } else if (representation.IsSmi()) {
       set_type(HType::Smi());
       if (SmiValuesAre32Bits()) {
@@ skipping 1362 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_