Allow rank 3 cp.async - #40222
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Closes #40201
Currently,
cp.asyncrefuses any GMEM ref that is not exactly 2-D. This PR relaxes that restriction. To test it,tests/mosaic/gpu_test.py::AsyncCopyTest::test_cp_async_tiledalready covers this path for rank 2, and_test_cp_asyncis rank-agnostic, so we just add a shape parameterization of(2, 64, 128)to the test.