Ensure correct enumeration indices in the dict

test/mjsunit/regress/regress-crbug-148376.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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-// Flags: --allow-natives-syntax
-
-function f(x) {
-  Math.log(Math.min(0.1, Math.abs(x)));
+function defineSetter(o) {
+  o.__defineSetter__('property', function() {});
 }
 
-f(0.1);
-f(0.1);
-%OptimizeFunctionOnNextCall(f);
-f(0.1);
+defineSetter(Object.prototype);
+property = 0;
+defineSetter(this);
+var keys = Object.keys(this);