`cuda.core.ObjectCode`: Support Tile IR

[leofang]

While we can't generate Tile IR yet (#1322), we can already load it from disk/memory:
https://github.com/NVIDIA/cutile-python/blob/9db6438f2beea52f9ae3632c9a6815061eb1c761/cext/tile_kernel.cpp#L124-L151

[leofang]

Ah... but the tile kernel calling convention is considered an implementation detail atm... @haijieg @brycelelbach @aterrel time to revisit the tile ABI discussion 🙂