This passes, though two of the interesting tests fail with what might be IREE
bugs (and so are currently skipped):
```shell
JAX_PLATFORMS='iree' pytest -n auto tests/core_test.py tests/api_test.py -k Dynamic
```
Executable results can be a tuple, if so iterate over the entires.
Copy to device should just return the the IREE buffer as device buffer
management is still in progress.
