[ONNX] Improve scripting inplace indexing ops (#44351)
Summary:
Fix a couple of issues with scripting inplace indexing in prepare_inplace_ops_for_onnx pass.
1- Tracing index copy (such as cases lik x[1:3] = data) already applies broadcasting on rhs if needed. The broadcasting node (aten::expand) is missing in scripting cases.
2- Inplace indexing with ellipsis (aten::copy_) is replaced with aten::index_put and then handled with slice+select in this pass.
Support for negative indices for this op added.
Shape inference is also enabled for scripting tests using new JIT API.
A few more tests are enabled for scripting.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44351
Reviewed By: ezyang
Differential Revision: D23880267
Pulled By: bzinodev
fbshipit-source-id: 78b33444633eb7ae0fbabc7415e3b16001f5207f
