Make it possible to create a v8::Function directly w/o a prototype

include/v8.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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 3241 matching lines @@
   static const int kDataIndex = 5;
   static const int kThisIndex = 6;
 
   V8_INLINE PropertyCallbackInfo(internal::Object** args) : args_(args) {}
   internal::Object** args_;
 };
 
 
 typedef void (*FunctionCallback)(const FunctionCallbackInfo<Value>& info);
 
+enum class ConstructorBehavior { kThrow, kAllow };
 
 /**
  * A JavaScript function object (ECMA-262, 15.3).
  */
 class V8_EXPORT Function : public Object {
  public:
   /**
    * Create a function in the current execution context
    * for a given FunctionCallback.
    */
-  static MaybeLocal<Function> New(Local<Context> context,
-                                  FunctionCallback callback,
-                                  Local<Value> data = Local<Value>(),
-                                  int length = 0);
+  static MaybeLocal<Function> New(
+      Local<Context> context, FunctionCallback callback,
+      Local<Value> data = Local<Value>(), int length = 0,
+      ConstructorBehavior behavior = ConstructorBehavior::kAllow);
   static V8_DEPRECATE_SOON(
       "Use maybe version",
       Local<Function> New(Isolate* isolate, FunctionCallback callback,
                           Local<Value> data = Local<Value>(), int length = 0));
 
   V8_DEPRECATED("Use maybe version",
                 Local<Object> NewInstance(int argc, Local<Value> argv[]) const);
   V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(
       Local<Context> context, int argc, Local<Value> argv[]) const;
 
@@ skipping 1200 matching lines @@
  *   child_instance.instance_accessor calls 'InstanceAccessorCallback'
  *   child_instance.instance_property == 3;
  * \endcode
  */
 class V8_EXPORT FunctionTemplate : public Template {
  public:
   /** Creates a function template.*/
   static Local<FunctionTemplate> New(
       Isolate* isolate, FunctionCallback callback = 0,
       Local<Value> data = Local<Value>(),
-      Local<Signature> signature = Local<Signature>(), int length = 0);
+      Local<Signature> signature = Local<Signature>(), int length = 0,
+      ConstructorBehavior behavior = ConstructorBehavior::kAllow);
 
   /** Get a template included in the snapshot by index. */
   static MaybeLocal<FunctionTemplate> FromSnapshot(Isolate* isolate,
                                                    size_t index);
 
   /**
    * Creates a function template with a fast handler. If a fast handler is set,
    * the callback cannot be null.
    */
   static Local<FunctionTemplate> NewWithFastHandler(
@@ skipping 4405 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_