Fix GraphConstructor and import_graph_def bug with variadic ops.
Prior to this change, GraphConstructor::PopulateMissingUnusedInputMapKey() didn't correctly compute the number of outputs for ops with variadic outputs. This meant that missing_unused_input_map_keys could contain spurious entries for unused variadic outputs, which could trigger a ValueError in import_graph_def. This also adds a new util method in node_def_util.h, NumOutputsForNode(). PiperOrigin-RevId: 213353158
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