viable/strict/1788508216: [Inductor] Route AOTI device type through DeviceOpOverrides (#193904)
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Summary Route AOTI/C++ wrapper ATen device type mapping through DeviceOpOverrides as the authoritative per-device contract. This removes the mutable global DEVICE_TO_ATEN mapping and lets both in-tree and out-of-tree backends provide their ATen device type through the existing device codegen extension point. Changes Add DeviceOpOverrides.aten_device_type() as the per-device contract for C++ ATen device type mapping.…
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