AssertionError when calling add_prefetch with SubArrayRefs
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- Python
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Description
Attempting to add a prefetch to a kernel with a SubArrayRef leads to an assertion error. Some mapper is attempting to create a new SubArrayRef but passes `None` for both `swept_inames` and `subscript`.
Reproducer:
```python
import loopy as lp
child_knl = lp.make_function(
"[N] -> {[i]: 0<=i {[i]: 0<=i
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