[hl] Invalid inline - type not replaced for FInstance

The following code results in an `Uncaught exception: Access violation Called from hl.types.ArrayDyn.get_length` on HL. Works on all other targets.

```haxe
@:forward
abstract OneOrMany(Array) from Array to Array {
@:from
static function fromSingle(value:T):OneOrMany {
return [value];
}
}

class Test {
inline
public static function firstItem(items:Array):T {
return (items == null || items.length == 0) ? null :items[0];
}

public static function traceFirstString(strings:OneOrMany) {
trace(firstItem(strings)); // access violation is raised here
}

public static function main() {
traceFirstString(["ab", "cd"]);
}
}
```

It works when I remove the `inline` declaration from the `firstItem` method