`@:generic` leaks type parameters

The following code:

``` haxe
class Main {
static function main() {
Test2.somethingElse(10);
}
}

class Test {
@:generic public static function something(t:T) {
return t;
}
}

@:forward
abstract Test2(Test) {
@:extern inline public static function somethingElse(t:T) {
return Test.something(t);
}
}
```

Will generate the following `-D dump` for `Test.something`:

```
static public something_somethingElse_T(method) : t : somethingElse.T -> somethingElse.T

= function(t:somethingElse.T) = {
var tmp = t;
return tmp;
}
```

That `somethingElse.T` comes from the abstract type