Generate a custom OSR entrypoint for OSR compiles on all platforms, and transition to optimized cod…

test/mjsunit/compiler/osr-warm.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.
 
 // Flags: --use-osr
 
-function f() {
-  var sum = 0;
-  for (var i = 0; i < 1000000; i++) {
-    var t = arguments[0] + 2;
-    var x = arguments[1] + 2;
-    var y = t + x + 5;
-    var z = y + 3;
-    sum += z;
+function f1(x) {
+  while (x > 0) {
+    x--;
+  }
+  return x;
+}
+
+assertEquals(0, f1(1));
+assertEquals(0, f1(10000000));
+
+function f2(x) {
+  var sum = 1;
+  while (x > 0) {
+    x--;
+    sum++;
   }
   return sum;
 }
 
-for (var i = 0; i < 4; i++) {
-  assertEquals(17000000, f(2, 3));
-}
+assertEquals(2, f2(1));
+assertEquals(10000001, f2(10000000));