Make PyTorch partially cross-compilable for Apple M1 (#49701)
Summary:
Update CPUINFO to include https://github.com/pytorch/cpuinfo/pull/51
Update sleef to include https://github.com/shibatch/sleef/pull/376
Modify aten/src/ATen/native/quantized/cpu/qnnpack/CMakeLists.txt to recognize CMAKE_OSX_ARCHITECTURES
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49701
Test Plan: `cmake -DCMAKE_OSX_ARCHITECTURES=x86_64 -DPYTHON_EXECUTABLE=/usr/bin/python3 -DUSE_XNNPACK=NO -DBUILD_TEST=YES .. -G Ninja; ninja basic` finishes successfully on Apple M1
Reviewed By: janeyx99
Differential Revision: D25669219
Pulled By: malfet
fbshipit-source-id: 5ee36b64e3a7ac76448f2a300ac4993375a26de5
