[turbofan] Use heavy-handed graph duplication to do loop peeling for OSR.

test/mjsunit/compiler/osr-nested3b.js

Index: test/mjsunit/compiler/osr-nested3b.js
diff --git a/test/mjsunit/compiler/osr-nested3.js b/test/mjsunit/compiler/osr-nested3b.js
similarity index 79%
copy from test/mjsunit/compiler/osr-nested3.js
copy to test/mjsunit/compiler/osr-nested3b.js
index b8f7e79a77f1d86cde42c5077fe87e2f8547325f..b9cbe2120939a3938fb5b5b85be2ef03a260e73f 100644
--- a/test/mjsunit/compiler/osr-nested3.js
+++ b/test/mjsunit/compiler/osr-nested3b.js
@@ -2,17 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --use-osr --turbo-osr
+// Flags: --allow-natives-syntax --use-osr --turbo-osr
 
 function f() {
   var sum = 0;
   for (var m = 99; m < 100; m++) {
     for (var i = 5; i < 6; i++) {
-      for (var j = 0; j < 1000000; j++) {
+      for (var j = 0; j < 1000; j++) {
         var x = i + 2;
         var y = x + 5;
         var z = y + 3;
         sum += z;
+        if (i == 25) %OptimizeOsr();
       }
       if (true) break;
     }