Fix illegal opcode bug in caffe2 (#40584)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40584
Also patch [this github issue](https://github.com/pytorch/pytorch/issues/33124)
involving an illegal assembly instruction in 8x8-dq-aarch64-neon.S.
Test Plan:
Build binaries, copy to shaker, run executables. Also run all
existing caffe tests.
Reviewed By: kimishpatel
Differential Revision: D22240670
fbshipit-source-id: 51960266ce58699fe6830bcf75632b92a122f638
