Remove always-on --harmony-rest-parameters flag

test/mjsunit/harmony/regress/regress-508074.js

Index: test/mjsunit/harmony/regress/regress-508074.js
diff --git a/test/mjsunit/harmony/regress/regress-508074.js b/test/mjsunit/harmony/regress/regress-508074.js
deleted file mode 100644
index 93f82cfd0c052825d24c4089dd752c24a3387a8d..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/regress/regress-508074.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-rest-parameters
-// Flags: --allow-natives-syntax
-
-var f = (a, b, ...c) => {
-  print(a);
-  print(b);
-  print(c);
-  assertEquals(6, a);
-  assertEquals(5, b);
-  assertEquals([4, 3, 2, 1], c);
-};
-
-function g() {
-  f(6, 5, 4, 3, 2, 1);
-};
-
-g();
-g();
-g();
-
-%OptimizeFunctionOnNextCall(g);
-g();