Skip `mrb_get_args()` in `mrb_ary_push()`.

src/array.c

@@ -508,19 +508,21 @@ mrb_ary_push(mrb_state *mrb, mrb_value ary, mrb_value elem)
 static mrb_value
 mrb_ary_push_m(mrb_state *mrb, mrb_value self)
 {
+  mrb_int argc;
   mrb_value *argv;
-  mrb_int len, len2, alen;
+  mrb_int len, len2;
   struct RArray *a;
 
-  mrb_get_args(mrb, "*!", &argv, &alen);
+  argc = mrb_get_argc(mrb);
+  argv = mrb_get_argv(mrb);
   a = mrb_ary_ptr(self);
   ary_modify(mrb, a);
   len = ARY_LEN(a);
-  len2 = len + alen;
+  len2 = len + argc;
   if (ARY_CAPA(a) < len2) {
     ary_expand_capa(mrb, a, len2);
   }
-  array_copy(ARY_PTR(a)+len, argv, alen);
+  array_copy(ARY_PTR(a)+len, argv, argc);
   ARY_SET_LEN(a, len2);
   while (alen--) {
     mrb_field_write_barrier_value(mrb, (struct RBasic*)a, *argv);