made floor/ceil return ints (#21124)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21124
ghimport-source-id: e3e45bd50c9af1ee03fd58f2f4d631ce23d9612e
Differential Revision: D15563187
Pulled By: Chillee
fbshipit-source-id: 6504a41da883a8287d64db20d40cf958edb7404c
