Revert D31547709: Remove THCGeneral.cpp
Test Plan: revert-hammer
Differential Revision:
D31547709 (https://github.com/pytorch/pytorch/commit/aa0c31876bbd0f9813ec6f000154a24c91beece9)
Original commit changeset: 059c47621863
fbshipit-source-id: e8c3597f2badbc5ecf356b381edea06a07331f24
