new classes: special construct stub for derived classs and TDZ for `this`.

src/scopes.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_SCOPES_H_
 #define V8_SCOPES_H_
 
 #include "src/ast.h"
 #include "src/zone.h"
 
@@ skipping 70 matching lines @@
   static bool Analyze(CompilationInfo* info);
 
   static Scope* DeserializeScopeChain(Isolate* isolate, Zone* zone,
                                       Context* context, Scope* script_scope);
 
   // The scope name is only used for printing/debugging.
   void SetScopeName(const AstRawString* scope_name) {
     scope_name_ = scope_name;
   }
 
-  void Initialize();
+  void Initialize(bool uninitialized_this = false);
 
   // Checks if the block scope is redundant, i.e. it does not contain any
   // block scoped declarations. In that case it is removed from the scope
   // tree and its children are reparented.
   Scope* FinalizeBlockScope();
 
   Isolate* isolate() const { return isolate_; }
   Zone* zone() const { return zone_; }
 
   // ---------------------------------------------------------------------------
@@ skipping 598 matching lines @@
                    Scope* outer_scope,
                    Handle<ScopeInfo> scope_info);
 
   AstValueFactory* ast_value_factory_;
   Zone* zone_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_