inline constructor fails when some function returns `this`

```haxe
function main() {
new Foo(10).foo(new Foo(Math.random()));
}

class Foo {
public var x:Float;

public inline function new(x) this.x = x;

public inline function foo(f:Foo) if (f.x > x) empty();

public inline function empty() {
x *= 0;
return this; // Commenting this line makes inline constructor work.
}
}
```
Results in:
```js
let _this = new Foo(10);
if(Math.random() > _this.x) {
_this.x *= 0;
}
```

Start by compiling the Haxe snippet from main() and comparing the generated JavaScript with the inline constructor, foo(), and empty() definitions. Inspect how the returned this from empty() affects inlining. Done means the reproducer generates correct behavior without requiring the return this line to be removed, with a regression test covering it.

Written by the indexing model from the issue text.