[mjsunit] Use OptimizeOsr to speed up test

Bug: v8:7783
Change-Id: I878e8dd8bcfb7b797515b44bbe4333a7d85e8cc4
Reviewed-on: https://chromium-review.googlesource.com/1101024Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53738}

test/mjsunit/regress/regress-298269.js

 // Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "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,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
-function Cb(a) {
+// Flags: --allow-natives-syntax
+
+function Cb(a, trigger) {
   var f, g;
   for(f = a.length; f--;) {
     g = a.charCodeAt(f);
     // This will fail after OSR if Runtime_StringCharCodeAt is modified
     // to iterates optimized frames and visit safepoint pointers.
+    if (g == "C".charCodeAt(0)) %OptimizeOsr();
   }
   return g;
 }
@@ -40,6 +20,5 @@ var s2 = "long string to make cons string 2";
 Cb(s1 + s2);
 Cb(s1);
 var s3 = "string for triggering osr in Cb";
-for (var i = 0; i < 16; i++) s3 = s3 + s3;
-Cb(s3);
+Cb(s3 + s3);
 Cb(s1 + s2);