[ONNX] Export tensor (#41872)
Summary:
Adding tensor symbolic for opset 9
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41872
Reviewed By: houseroad
Differential Revision: D22968426
Pulled By: bzinodev
fbshipit-source-id: 70e1afc7397e38039e2030e550fd72f09bac7c7c
