Fixed Select symbolic to export slice when index = negative one (#25273)
Summary:
Exporting torch.select when index = negative one (x[:,-1]) was broken. This PR has the fix in symbolic function for select.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25273
Reviewed By: hl475
Differential Revision: D17159707
Pulled By: houseroad
fbshipit-source-id: 2c3b275421082758f1b63c1c9b6e578f03ca9f76
