Avoid duplicate lookups when Get+Creating identity hashes

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 1907 matching lines @@
 
   MUST_USE_RESULT static Maybe<PropertyAttributes> GetPropertyAttributes(
       LookupIterator* it);
 
   // Set the object's prototype (only JSReceiver and null are allowed values).
   MUST_USE_RESULT static Maybe<bool> SetPrototype(Handle<JSReceiver> object,
                                                   Handle<Object> value,
                                                   bool from_javascript,
                                                   ShouldThrow should_throw);
 
-
-  static Handle<Object> GetDataProperty(Handle<JSReceiver> object,
-                                        Handle<Name> name);
+  inline static Handle<Object> GetDataProperty(Handle<JSReceiver> object,
+                                               Handle<Name> name);
   static Handle<Object> GetDataProperty(LookupIterator* it);
 
 
   // Retrieves a permanent object identity hash code. The undefined value might
   // be returned in case no hash was created yet.
   static inline Handle<Object> GetIdentityHash(Isolate* isolate,
                                                Handle<JSReceiver> object);
 
   // Retrieves a permanent object identity hash code. May create and store a
   // hash code if needed and none exists.
@@ skipping 265 matching lines @@
   // if the property doesn't exist (or if called on a detached proxy),
   // otherwise returns the value set for the key.
   Object* GetHiddenProperty(Handle<Name> key);
   // Deletes a hidden property. Deleting a non-existing property is
   // considered successful.
   static void DeleteHiddenProperty(Handle<JSObject> object,
                                    Handle<Name> key);
   // Returns true if the object has a property with the hidden string as name.
   static bool HasHiddenProperties(Handle<JSObject> object);
 
-  static void SetIdentityHash(Handle<JSObject> object, Handle<Smi> hash);
-
   static void ValidateElements(Handle<JSObject> object);
 
   // Makes sure that this object can contain HeapObject as elements.
   static inline void EnsureCanContainHeapObjectElements(Handle<JSObject> obj);
 
   // Makes sure that this object can contain the specified elements.
   static inline void EnsureCanContainElements(
       Handle<JSObject> object,
       Object** elements,
       uint32_t count,
@@ skipping 8643 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_