Getting rid of ExitContextStatement for scoped blocks.

src/parser.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1567 matching lines @@
         body->AddStatement(stat);
         block_finder.Update(stat);
       }
     }
   }
   Expect(Token::RBRACE, CHECK_OK);
   top_scope_ = saved_scope;
 
   block_scope = block_scope->FinalizeBlockScope();
   body->set_block_scope(block_scope);
-
-  if (block_scope != NULL) {
-    // Rewrite the block { B } to a block: { { B } ExitContext; }
-    Block* exit = new(zone()) Block(isolate(), NULL, 2, false);
-    exit->AddStatement(body);
-    exit->AddStatement(new(zone()) ExitContextStatement());
-    return exit;
-  } else {
-    return body;
-  }
+  return body;
 }
 
 
 Block* Parser::ParseVariableStatement(VariableDeclarationContext var_context,
                                       bool* ok) {
   // VariableStatement ::
   //   VariableDeclarations ';'
 
   Handle<String> ignore;
   Block* result = ParseVariableDeclarations(var_context,
@@ skipping 3627 matching lines @@
       result = parser.ParseProgram(source,
                                    info->is_global(),
                                    info->StrictMode());
     }
   }
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal