Revert D27622277: [pytorch][PR] avoid CPU std::copysign segfault when compiling on arm64 with gcc 7.5 / 8 for CUDA
Test Plan: revert-hammer
Differential Revision:
D27622277 (https://github.com/pytorch/pytorch/commit/3bb1f59a9c3801409a20d34a613214b4209e2a22)
Original commit changeset: a1dc4c3a67f9
fbshipit-source-id: 352443cec6ae0ba794e559f92578192cefbe2ab4
