Fix for tests on ROCm (#37616)
Summary:
This pull request fixes and re-enables two of the tests disabled in https://github.com/pytorch/pytorch/issues/37427
1. `test_sparse_add_out_bfloat16` in test_sparse.py fixed to use updated `atol` argument instead of `prec` for `assertEqual`
2. The conversion of `flt_min` to `int64` is divergent on HIP compared to numpy. The change removes that conversion from the `test_float_to_int_conversion_finite` test case in test_torch.py
cc: ezyang jeffdaily
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37616
Differential Revision: D21379876
Pulled By: ezyang
fbshipit-source-id: 2bfb41d67874383a01330c5d540ee516b3b07dcc
