Previously we always generated factories for contextful lambdas:
```kt
fun foo(a: Int) = { a }
```
```js
function foo(a_38) {
return foo$lambda(a_38);
}
// factory!
function foo$lambda($a) {
return function () {
return $a;
};
}
```
After this patch, the generated code for `foo` is more concise:
```js
function foo(a) {
return function() { return a; };
}
```
Sergej Jaskiewicz
c10af22b27