Add a mode to completely deserialize scope chains

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index 7bde0a721bf8f3c4f07bdbbb4c3ac55229652c35..c0f77fe5f94d90fac03ba100256ecf8df0c50307 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -254,6 +254,10 @@ class ParserBase : public Traits {
 
   void set_stack_limit(uintptr_t stack_limit) { stack_limit_ = stack_limit; }
 
+  Scope* NewScriptScope() {
+    return new (zone()) Scope(zone(), nullptr, SCRIPT_SCOPE, kNormalFunction);
+  }
+
  protected:
   enum AllowRestrictedIdentifiers {
     kAllowRestrictedIdentifiers,
@@ -615,10 +619,6 @@ class ParserBase : public Traits {
     Mode old_mode_;
   };
 
-  Scope* NewScriptScope() {
-    return new (zone()) Scope(zone(), nullptr, SCRIPT_SCOPE, kNormalFunction);
-  }
-
   Scope* NewScope(ScopeType scope_type) {
     return NewScopeWithParent(scope(), scope_type);
   }