Support OSR in for-in loops.

test/mjsunit/compiler/optimized-for-in.js

 // Copyright 2012 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
@@ skipping 224 matching lines @@
   o.c = 3;
   o.d = 4;
   o.e = 5;
   o.f = 6;
   return o;
 }, function (t) {
   var r = [];
   for (var i in t) r.push(i + t[i]);
   return r.join('');
 });
+
+// Test OSR inside for each.

[fschneider, 2012/02/22 15:29:59]

s/for each/for-in/

+function osr (t) {
+  var sum = 0;
+  for (var x in t) {
+      for (var i = 0; i < t[x].length; i++) {
+        sum += t[x][i];
+      }
+  }
+  return sum;
+}
+
+function test_osr() {
+  with ({}) {}  // Disable optimizations of this function.
+  var arr = new Array(1000000);
+  for (var i = 0; i < arr.length; i++) arr[i] = i;
+  osr({x: arr});
+}
+
+test_osr();