[analyzer] immediately-invoked-by-analyzer anonymous functions are not optimized away

```haxe
class Main {
static function main() {
var f = a -> a;
trace(f(3));

trace((a -> a)(3));
}
}
```

```js
console.log("src/Main.hx:4:",(function(a) {
return a;
})(3));
console.log("src/Main.hx:6:",3);
```

This is because IIFE optimization is done before the analyzer optimization, but maybe it should be done both before and after it.