interpreter doesn't handle device_print properly

[hgl71964]

currently the interpreter doesn't handle device_print: https://github.com/openai/triton/blob/dc45d2640f8b2e5edcf322025a6b78e70625fea7/python/triton/runtime/interpreter.py#L347

A quick fix might uncomment the line and add a handler, but I am not sure what's the desirable format of printing?