Revert of Optimize trivial regexp disjunctions

test/mjsunit/regress/regress-chromium-482998.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.
-
-// Should not time out.  Running time 0.5s vs. 120s before the change.
-function collapse() {
-  var src = "(?:";
-  for (var i = 128; i < 0x1000; i++) {
-    src += "a" + String.fromCharCode(i) + "|";
-  }
-  src += "aa)";
-  var collapsible = new RegExp(src);
-  var subject = "zzzzzzz" + String.fromCharCode(3000);
-  for (var i = 0; i < 1000; i++) {
-    subject += "xxxxxxx";
-  }
-  for (var i = 0; i < 2000; i++) {
-    assertFalse(collapsible.test(subject));
-  }
-}
-
-collapse();