Install the constructor property on custom prototype before optimizing it as a prototype

src/factory.h

 // Copyright 2014 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_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 
 namespace v8 {
@@ skipping 467 matching lines @@
                                  bool read_only_prototype = false);
   Handle<JSFunction> NewFunction(Handle<String> name);
   Handle<JSFunction> NewFunctionWithoutPrototype(Handle<String> name,
                                                  Handle<Code> code);
 
   Handle<JSFunction> NewFunctionFromSharedFunctionInfo(
       Handle<SharedFunctionInfo> function_info,
       Handle<Context> context,
       PretenureFlag pretenure = TENURED);
 
-  Handle<JSFunction> NewFunction(Handle<String> name,
-                                 Handle<Code> code,
-                                 Handle<Object> prototype,
-                                 InstanceType type,
+  Handle<JSFunction> NewFunction(Handle<String> name, Handle<Code> code,
+                                 Handle<Object> prototype, InstanceType type,
                                  int instance_size,
-                                 bool read_only_prototype = false);
+                                 bool read_only_prototype = false,
+                                 bool install_constructor = false);
   Handle<JSFunction> NewFunction(Handle<String> name,
                                  Handle<Code> code,
                                  InstanceType type,
                                  int instance_size);
 
   // Create a serialized scope info.
   Handle<ScopeInfo> NewScopeInfo(int length);
 
   // Create an External object for V8's external API.
   Handle<JSObject> NewExternal(void* value);
@@ skipping 222 matching lines @@
   // Reinitialize a JSProxy into an (empty) JS object of respective type and
   // size, but keeping the original prototype.  The receiver must have at least
   // the size of the new object.  The object is reinitialized and behaves as an
   // object that has been freshly allocated.
   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_