[parsing]: eval/arguments parameter names are ok in sloppy mode

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index c11bbd1629f66cf05aa0de2597504f8ede45a840..9f8fc13653a893d8c2adc7fcc2884773f2fd8f34 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -475,7 +475,7 @@ class ParserBase : public Traits {
                                    bool* ok) {
     if (is_sloppy(language_mode) && !strict_params) return;
 
-    if (eval_args_error_loc.IsValid()) {
+    if (is_strict(language_mode) && eval_args_error_loc.IsValid()) {
       Traits::ReportMessageAt(eval_args_error_loc, "strict_eval_arguments");
       *ok = false;
       return;