Wrong error message in TypeError produced by for..of with null object

[Joseph Pecoraro]

Summary:
Wrong error message in TypeError produced by for..of with null object

Test:
<script>
function foo() {
    let chain = Promise.resolve();
    for (let x of null)
        console.log(x);
}
foo();
</script>

Steps to Reproduce:
1. Load test case without the inspector open
2. Open the inspector to view the uncaught exception
  => Wrong message, but points to the correct location
    [Error] TypeError: null is not an object (evaluating 'Promise.resolve()')