Don't schedule second pass callbacks if there are no callbacks

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 414 matching lines @@
 
   V8_INLINE V8_DEPRECATED("use indexed version",
                           void* GetInternalField1() const) {
     return internal_fields_[0];
   }
   V8_INLINE V8_DEPRECATED("use indexed version",
                           void* GetInternalField2() const) {
     return internal_fields_[1];
   }
 
-  bool IsFirstPass() const { return callback_ != nullptr; }
+  V8_DEPRECATED("Not realiable once SetSecondPassCallback() was used.",
+                bool IsFirstPass() const) {
+    return callback_ != nullptr;
+  }
 
   // When first called, the embedder MUST Reset() the Global which triggered the
   // callback. The Global itself is unusable for anything else. No v8 other api
   // calls may be called in the first callback. Should additional work be
   // required, the embedder must set a second pass callback, which will be
   // called after all the initial callbacks are processed.
   // Calling SetSecondPassCallback on the second pass will immediately crash.
   void SetSecondPassCallback(Callback callback) const { *callback_ = callback; }
 
  private:
@@ skipping 8077 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_