Mark as prototype only after instantiating the function

src/objects.h

 // Copyright 2012 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 "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/builtins.h"
@@ skipping 6188 matching lines @@
   inline void set_is_observed() {
     set_bit_field(bit_field() | (1 << kIsObserved));
   }
 
   inline bool is_observed() {
     return ((1 << kIsObserved) & bit_field()) != 0;
   }
 
   inline void set_is_extensible(bool value);
   inline bool is_extensible();
-  inline void mark_prototype_map();
+  inline void set_is_prototype_map(bool value);
   inline bool is_prototype_map();
 
   inline void set_elements_kind(ElementsKind elements_kind) {
     DCHECK(elements_kind < kElementsKindCount);
     DCHECK(kElementsKindCount <= (1 << Map::ElementsKindBits::kSize));
     set_bit_field2(Map::ElementsKindBits::update(bit_field2(), elements_kind));
     DCHECK(this->elements_kind() == elements_kind);
   }
 
   inline ElementsKind elements_kind() {
@@ skipping 314 matching lines @@
                                               Handle<Name> name,
                                               Handle<Object> value,
                                               PropertyAttributes attributes,
                                               StoreFromKeyed store_mode);
 
   inline void AppendDescriptor(Descriptor* desc);
 
   // Returns a copy of the map, with all transitions dropped from the
   // instance descriptors.
   static Handle<Map> Copy(Handle<Map> map);
-  static Handle<Map> CopyAsPrototypeMap(Handle<Map> map);
   static Handle<Map> Create(Handle<JSFunction> constructor,
                             int extra_inobject_properties);
 
   // Returns the next free property index (only valid for FAST MODE).
   int NextFreePropertyIndex();
 
   // Returns the number of properties described in instance_descriptors
   // filtering out properties with the specified attributes.
   int NumberOfDescribedProperties(DescriptorFlag which = OWN_DESCRIPTORS,
                                   PropertyAttributes filter = NONE);
@@ skipping 1220 matching lines @@
   DECL_ACCESSORS(literals_or_bindings, FixedArray)
 
   inline FixedArray* literals();
   inline void set_literals(FixedArray* literals);
 
   inline FixedArray* function_bindings();
   inline void set_function_bindings(FixedArray* bindings);
 
   // The initial map for an object created by this constructor.
   inline Map* initial_map();
-  inline void set_initial_map(Map* value);
+  static void SetInitialMap(Handle<JSFunction> function, Handle<Map> map);
   inline bool has_initial_map();
   static void EnsureHasInitialMap(Handle<JSFunction> function);
 
   // Get and set the prototype property on a JSFunction. If the
   // function has an initial map the prototype is set on the initial
   // map. Otherwise, the prototype is put in the initial map field
   // until an initial map is needed.
   inline bool has_prototype();
   inline bool has_instance_prototype();
   inline Object* prototype();
@@ skipping 3476 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_