Std.int in abstract

``` haxe
package;

class Main
{
static function main()
{
trace((1.5555:R));
}
}

abstract R(Float) to Float {

private inline function new(v:Float)
this = Std.int(v);

@:from
public static inline function fromFloat(v:Float):R
return new R(v);
}
```

`1` is expected, but got `1.5555` on java & cs @ 7230d00

This is regression, it worked in 3.2.1