[crankshaft] Fix another deopt loop in slow mode for-in.

test/mjsunit/regress/regress-3650-3.js

 // Copyright 2016 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
 
-Array.prototype.__proto__ = null;
-var prototype = Array.prototype;
-function f() {
-  prototype.lastIndexOf({});
+function foo(a) {
+  for (var d in a) {
+    delete a[1];
+  }
 }
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
+
+foo([1,2,3]);
+foo([2,3,4]);
+%OptimizeFunctionOnNextCall(foo);
+foo([1,2,3]);
+assertOptimized(foo);