Revert of Canonicalize handles for optimized compilation.

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 948 matching lines @@
 
  private:
   // Make it hard to create heap-allocated or illegal handle scopes by
   // disallowing certain operations.
   SealHandleScope(const SealHandleScope&);
   void operator=(const SealHandleScope&);
   void* operator new(size_t size);
   void operator delete(void*, size_t);
 
   internal::Isolate* isolate_;
+  int prev_level_;
   internal::Object** prev_limit_;
-  int prev_sealed_level_;
 };
 
 
 // --- Special objects ---
 
 
 /**
  * The superclass of values and API object templates.
  */
 class V8_EXPORT Data {
@@ skipping 7428 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_