[python] "<Int32> |= <Int>" not clamping result to 32 bits

Code to reproduce:
```haxe
import haxe.Int32;

class Test {
static function main():Void {
var i32:Int32 = 15459750;
var arr:Array = [178,0,0];
var next = 0;

i32 |= (arr[next] << 24);

trace(i32);
}
}
```

Expected: `-1293163098`
Actual: `3001804198`

Tested on haxe 3.4rc, win7 64bit

Notes: works correctly on lua and neko