Revert D22458928: [pytorch][PR] Use explicit templates in CUDALoops kernels
Test Plan: revert-hammer
Differential Revision:
D22458928 (https://github.com/pytorch/pytorch/commit/e374280768bd369f617fa1d5d0066b83297f4608)
Original commit changeset: cca623bb6e76
fbshipit-source-id: 6dd24f783ec3b781140f314716ffb02f0892c57a
