Allocate script scopes using a separate constructor

src/parsing/parser-base.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_PARSING_PARSER_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/base/hashmap.h"
@@ skipping 589 matching lines @@
     ~ParsingModeScope() {
       parser_->mode_ = old_mode_;
     }
 
    private:
     ParserBase* parser_;
     Mode old_mode_;
   };
 
   DeclarationScope* NewScriptScope() {
-    return new (zone()) DeclarationScope(zone(), nullptr, SCRIPT_SCOPE);
+    return new (zone()) DeclarationScope(zone());
   }
 
   DeclarationScope* NewVarblockScope() {
     return new (zone()) DeclarationScope(zone(), scope(), BLOCK_SCOPE);
   }
 
   ModuleScope* NewModuleScope(DeclarationScope* parent) {
     return new (zone()) ModuleScope(zone(), parent, ast_value_factory());
   }
 
@@ skipping 3133 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H