onnxruntime

6f863ae2 - Allow optional axes tensor to be null and ignore it as optional (#18423)

Allow optional axes tensor to be null and ignore it as optional (#18423) ### Description Our function inliner converts call nodes to a proto. `Node::ToProto()` function recreates optional NodeArgs into a `NodeProto`. While handling missing input parameters, our inliner simply renames them as empty strings. `Graph::InlineFunctionProto()` recreates missing NodeArgs even though the original call node did not have them. This results in the below mentioned issue. The inlined model has the following entries, notice the second argument is present, but has no value in `ReduceSum` call (from a Dynamo exported model). > InsertedPrecisionFreeCast__inlfunc__aten_linalg_vector_norm_no_dim_onnx_result_12 = ReduceSum <keepdims: int = 0, noop_with_empty_axes: int = 0> (InsertedPrecisionFreeCast__inlfunc_ReduceL1_data_abs, ) We now allow second input to ReduceSum to be nullptr and ignore it as it is optional. ### Motivation and Context This seeks to address https://github.com/microsoft/onnxruntime/issues/18338