Revert D30652629: use irange for loops
Test Plan: revert-hammer
Differential Revision:
D30652629 (https://github.com/pytorch/pytorch/commit/687c2267d4dfb69138483f90deb4d4f5921a2965)
Original commit changeset: 0ae6c4bbbb55
fbshipit-source-id: 5c4f067b584a021c8c9656454d1ee60999600fb3
