Add compiler pass that converts new+anonymous function to IIFE

Now compiler can't optimize constructions like:
```
new function() {
console.log(1);
};
```
As i know this is equal to:
```
(function() {
console.log(1);
return {};
})()
```
which can be simplified to:
```
console.log(1);
```

Is it possible to add similar pass to main optimization loop or update inlineFunctions pass to support it?