Use Scope::function_kind_ to distinguish arrow function scopes

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 9894339c45c4c732d6b253b553864d8e24d8d1f8..9113e8c7a4e3ba46b936b38d1f4627ff0c426cf4 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -1190,7 +1190,7 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info,
 
     if (shared_info->is_arrow()) {
       Scope* scope =
-          NewScope(scope_, ARROW_SCOPE, FunctionKind::kArrowFunction);
+          NewScope(scope_, FUNCTION_SCOPE, FunctionKind::kArrowFunction);
       scope->SetLanguageMode(shared_info->language_mode());
       scope->set_start_position(shared_info->start_position());
       ExpressionClassifier formals_classifier;