Add Tensor overload for start in narrow. (#34317)
Summary:
https://github.com/pytorch/pytorch/issues/31558
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34317
Differential Revision: D20294333
Pulled By: ailzhang
fbshipit-source-id: 47c6646ae298e04a455923bd5048db026a5e3c7c
