[mjsunit] Speed up regress-1257

This test used to run 10M loop iterations to trigger OSR. Let's run 5
instead and trigger OSR manually through the runtime.

Bug: v8:7093
Change-Id: Ie0cdb9389ca465bf433e81a17fa60c300edc3e29
Reviewed-on: https://chromium-review.googlesource.com/785693
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49579}

test/mjsunit/mjsunit.status

@@ -633,7 +633,6 @@
   'regress/regress-740784': [SKIP],
   'regress/regress-crbug-482998': [PASS, SLOW],
   'regress/regress-91008': [PASS, SLOW],
-  'regress/regress-1257': [PASS, SLOW],
   'harmony/regexp-property-lu-ui': [PASS, SLOW],
   'whitespaces': [PASS, SLOW],
   'wasm/grow-memory': [PASS, SLOW],

test/mjsunit/regress/regress-1257.js

-// Copyright 2011 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.
+// Copyright 2017 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: --allow-natives-syntax
 
 function g(y) { assertEquals(y, 12); }
 
@@ -39,14 +18,11 @@ function foo () {
         l = 0;
         break;
       case 0:
-        // Loop for to hit OSR.
-        if (cnt++ < 10000000) {
-          l = 0;
-          break;
-        } else {
+        if (cnt++ == 5) {
+          %OptimizeOsr();
           l = 1;
-          break;
         }
+        break;
       case 1:
         // This case will contain deoptimization
         // because it has no type feedback.