📰 trunk/4b169340ef40f11b42b52925f1329a18a152d9e1: [dynamo] Support retracing inference_mode helpers (#185066)

Generated Dynamo graphs for torch.inference_mode() contain calls to
torch.autograd.grad_mode._enter_inference_mode and _exit_inference_mode.
Retracing those graphs used to treat _enter_inference_mode as an ordinary
in-graph torch function, then failed when handle_traced_output tried to wrap
its non-Tensor _InferenceMode return value.
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