onnxruntime

979d6315 - Add level two optimizations for constant propagation transformation. (#7410)

Add level two optimizations for constant propagation transformation. (#7410) * Made the python script generating the testcases modular. * Modified RemoveBackToBackCasts function to remove cast even if the parent node has other consumers. * Modified InsertCastNodes to update the graph consistently for other functions to work. * Moved ConcatNames function to the top. * PropagateBackward/SearchUpstream and PropagateFP16CastsFromOutputsToInputs insert FP32 casts if the level >1 in order to propagate FP16 casts backwards. * Added new testcases for level two setting.