Proper Tail Optimization doesn't work

GNU Guile has now a working [prototype of a compiler backend that generates JavaScript](https://gitlab.com/ijp/guile/tree/compile-to-js-2017).

It use lots of tail calls. I compiled it with traceur using the following command:

```sh
$ traceur --out script.js --script out.prettier.js --proper-tail-calls  --experimental
```

I run it in chrome using the following html file:

```html
<html>
  <body>
    <script src="https://google.github.io/traceur-compiler/bin/traceur.js"></script>
    <script src="https://google.github.io/traceur-compiler/bin/BrowserSystem.js"></script>
    <script src="/script.js" type="text/javascript"></script>
  </body>
</html>
```

It fails with a `Uncaught RangeError: Maximum call stack size exceeded`.

The original scheme program is:

```scheme
(js-invoke (js-eval "console") "log" "héllo world")
```

The input JavaScript file can be found [here](https://gist.github.com/amirouche/9c922e34517843edde4b4a6cdaf50a0a). That input file is correctly intrepreted by nodejs v8.4.0 using the `--harmony_tailcalls` flag.

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Proper Tail Optimization doesn't work #2140

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Proper Tail Optimization doesn't work #2140

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