Loops create redundant "arguments" variables

Like #120, but for "arguments" instead of "this". Let me use the same example:

[Minimal example](https://buble.surge.sh/#function%20bar()%20%7B%0A%20%20while%20(true)%20arguments%3B%0A%7D):
```js
function bar() {
while (true) arguments;
}
```

Produces:
```js
function bar() {
var arguments$1 = arguments;

while (true) { arguments$1; }
}
```

Expected output:
```js
function bar() {
while (true) { arguments; }
}
```

#120 was fixed in #121, but I don't feel confident enough to propose a PR myself.

Reproduce the minimal example from the issue and compare the behavior with the fix described in #120 and #121. The work is done when transforming the example no longer creates a redundant arguments$1 variable and produces the expected output.

Written by the indexing model from the issue text.