test_regression_reduction_in_conditional fails on Mac M1 with pocl 1.8

```
def test_regression_reduction_in_conditional(ctx_factory):
# Regression test for https://github.com/inducer/pytato/pull/255
# which was ultimately caused by https://github.com/inducer/loopy/issues/533
# Reproducer from
# https://github.com/inducer/pytato/pull/255#issuecomment-1028248714

ctx = ctx_factory()
cq = cl.CommandQueue(ctx)

def kernel(usr_np, _pt_data_9):
_pt_tmp_53 = _pt_data_9 @ _pt_data_9
_pt_tmp_42 = usr_np.maximum(_pt_tmp_53, _pt_tmp_53)
_pt_tmp_27 = usr_np.sum(_pt_tmp_42)
_pt_tmp_0 = usr_np.maximum(_pt_tmp_27, _pt_tmp_53)
return _pt_tmp_0

def get_np_input_args():
return {
"_pt_data_9": np.ones((2, 2)),
}

np_inputs = get_np_input_args()
np_result = kernel(np, **np_inputs)
pt_dag = kernel(pt, **{kw: pt.make_data_wrapper(arg)
for kw, arg in np_inputs.items()})

knl = pt.generate_loopy(pt_dag, options=lp.Options(write_cl=True))

_, (pt_result,) = knl(cq)

from pytato.analysis import get_num_nodes
print(get_num_nodes(pt_dag))

> np.testing.assert_allclose(pt_result, np_result)
E AssertionError:
E Not equal to tolerance rtol=1e-07, atol=0
E
E Mismatched elements: 4 / 4 (100%)
E Max absolute difference: 8.
E Max relative difference: 1.
E x: array([[0., 0.],
E [0., 0.]])
E y: array([[8., 8.],
E [8., 8.]])

test/test_codegen.py:1580: AssertionError
```