Fix OSR to ignore phis without merge index in loop entry.

test/mjsunit/compiler/escape-analysis.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
@@ skipping 182 matching lines @@
     x: { get:getter, set:setter },
     y: { get:getter, set:setter }
   });
   check(23, 42); check(23, 42);
   %OptimizeFunctionOnNextCall(check);
   check(23, 42); check(23, 42);
   constructor.prototype = monkey;
   check(27, 27); check(27, 27);
   assertEquals(130, sum);
 })();
+
+
+// Test OSR into a loop with captured objects.
+(function testOSR() {
+  function constructor() {
+    this.a = 23;
+  }
+  function osr1(length) {
+    assertEquals(23, (new constructor()).a);
+    var result = 0;
+    for (var i = 0; i < length; i++) {
+      result = (result + i) % 99;
+    }
+    return result;
+  }
+  function osr2(length) {
+    var result = 0;
+    for (var i = 0; i < length; i++) {
+      result = (result + i) % 99;
+    }
+    assertEquals(23, (new constructor()).a);
+    return result;
+  }
+  function osr3(length) {
+    var result = 0;
+    var o = new constructor();
+    for (var i = 0; i < length; i++) {
+      result = (result + i) % 99;
+    }
+    assertEquals(23, o.a);
+    return result;
+  }
+  function test(closure) {
+    assertEquals(45, closure(10));
+    assertEquals(45, closure(10));
+    assertEquals(10, closure(50000));
+  }
+  test(osr1);
+  test(osr2);
+  test(osr3);
+})();