Don't track function-kind through FunctionState, always read from underlying scope

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index d17d2312d6047f574f79c8bfef6c286ca705a670..3785f5820a70c414ae699f364e411af1b7d4d48d 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -793,8 +793,7 @@ class PreParser : public ParserBase<PreParser> {
     // the global scope.
     if (is_module) scope = NewModuleScope(scope);
 
-    FunctionState top_scope(&function_state_, &scope_state_, scope,
-                            kNormalFunction);
+    FunctionState top_scope(&function_state_, &scope_state_, scope);
     bool ok = true;
     int start_position = scanner()->peek_location().beg_pos;
     parsing_module_ = is_module;