[mjsunit] Speed up array constructor test

Bug: v8:7783
Change-Id: Ieb29bcbd7400a84619aaf08ad86f8847e8bd78c3
Reviewed-on: https://chromium-review.googlesource.com/1101023
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53742}

test/mjsunit/array-constructor.js

 // Copyright 2008 the V8 project authors. All rights reserved.
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-// modification, are permitted provided that the following conditions are
-// met:
-//
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-//     * Redistributions in binary form must reproduce the above
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-//       with the distribution.
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-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
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-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 var loop_count = 5
 
@@ -84,26 +61,26 @@ function innerArrayLiteral(n) {
   return a.join();
 }
 
-
-function testConstructOfSizeSize(n) {
-  var str = innerArrayLiteral(n);
-  var a = eval('[' + str + ']');
-  var b = eval('new Array(' + str + ')')
-  var c = eval('Array(' + str + ')')
-  assertEquals(n, a.length);
+function testConstruction(len, elements_str) {
+  var a = eval('[' + elements_str + ']');
+  var b = eval('new Array(' + elements_str + ')')
+  var c = eval('Array(' + elements_str + ')')
+  assertEquals(len, a.length);
   assertArrayEquals(a, b);
   assertArrayEquals(a, c);
 }
 
-
 for (var i = 0; i < loop_count; i++) {
-  // JSObject::kInitialMaxFastElementArray is 10000.
-  for (var j = 1000; j < 12000; j += 1000) {
-    testConstructOfSizeSize(j);
+  const N = 2000;
+  const literal = innerArrayLiteral(N);
+  let str = literal;
+  // JSObject::kInitialMaxFastElementArray is approximately 10000.
+  for (var j = N; j <= 12000; j += N) {
+    testConstruction(j, str);
+    str += ", " + literal;
   }
 }
 
-
 for (var i = 0; i < loop_count; i++) {
   assertArrayEquals(['xxx'], new Array('xxx'));
   assertArrayEquals(['xxx'], Array('xxx'));