Remove flags for ES2015 features shipped in M48

test/mjsunit/es6/array-length.js

 // 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-tolength
-
 // Test array functions do not cause infinite loops when length is negative,
 // max_value, etc.
 
 // ArrayToString
 
 var o = { length: Number.MIN_VALUE };
 var result = Array.prototype.toString.call(o);
 assertEquals("[object Object]", result);
 
 // ArrayToLocaleString
@@ skipping 176 matching lines @@
 
 var o = { length: Number.MIN_VALUE };
 Array.prototype.reduceRight.call(o, func, 0);
 assertEquals(Number.MIN_VALUE, o.length);
 
 // ArrayFill
 
 var o = { length: Number.MIN_VALUE };
 Array.prototype.fill(o, 0);
 assertEquals(Number.MIN_VALUE, o.length);