[ONNX] Fix export of copy_ operator (#51938) (#54870)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54870
copy_operator before going into onnx exporter is being decomposed into aten::expand_as and aten::index_put.
There is a scenario where inputs to copy are not of the same type, but copy op in torch does implicit casting that is not currently reflected inside onnx exporter. This PR is adding casting inside index_put symbolic in case when tensor self is not of the same type as values.
Test Plan: Imported from OSS
Reviewed By: nikithamalgifb
Differential Revision: D27408975
Pulled By: SplitInfinity
fbshipit-source-id: 15022703e76b9c98b02285c06b13d44f3c4a3f00
