Add decomposition for aten.miopen_batch_norm#4482
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Signed-off-by: Rahul Kayaith <rkayaith@gmail.com>
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On ROCm 7.1+ with MIOpen 3.5+, PyTorch decomposes
BatchNorm2dwith channels-last layout toaten.miopen_batch_norminstead ofaten._native_batch_norm_legit_functional. torch-mlir didn't support this op, causing legalization to fail. This registers the op and just decomposes it toaten.native_batch_norm, like pytorch inductor does.Fixes #4476