Get rid of ParseInfo::lazy

src/background-parsing-task.cc

Index: src/background-parsing-task.cc
diff --git a/src/background-parsing-task.cc b/src/background-parsing-task.cc
index f316d8c952512212ff440d4ad20acaf987287667..03ff4ba14f737febde750ce4a7150e777058f54b 100644
--- a/src/background-parsing-task.cc
+++ b/src/background-parsing-task.cc
@@ -31,6 +31,7 @@ BackgroundParsingTask::BackgroundParsingTask(
   // will happen in the main thread after parsing.
   Zone* zone = new Zone(isolate->allocator());
   ParseInfo* info = new ParseInfo(zone);
+  info->set_toplevel();
   source->zone.reset(zone);
   source->info.reset(info);
   info->set_isolate(isolate);