Give better error in run_hlo_module if HLO has collectives. #29077
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Before, it would segfault, as run_hlo_module (and xla::HloRunner in general) doesn't set a DeviceAssignment and the CollectiveThunk would try to deference a null DeviceAssignment pointer. I keep accidentally using run_hlo_module instead of multihost_hlo_runner and got sick of the segfaults. PiperOrigin-RevId: 784773808
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Give better error in run_hlo_module if HLO has collectives.
Before, it would segfault, as run_hlo_module (and xla::HloRunner in general) doesn't set a DeviceAssignment and the CollectiveThunk would try to deference a null DeviceAssignment pointer. I keep accidentally using run_hlo_module instead of multihost_hlo_runner and got sick of the segfaults.