Add a mode to completely deserialize scope chains

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 5c7442bb9e02188bbf8b51cbfec4cef4ade92526..e32494d35388ae1a0b6cdb075027397121f301eb 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -722,6 +722,10 @@ class Parser : public ParserBase<ParserTraits> {
   void Internalize(Isolate* isolate, Handle<Script> script, bool error);
   void HandleSourceURLComments(Isolate* isolate, Handle<Script> script);
 
+  void set_original_scope(Scope* original_scope) {
+    original_scope_ = original_scope;
+  }
+
  private:
   friend class ParserTraits;
   friend class DiscardableZoneScope;