Disable NEON acceleration on older compilers (#47099)
Summary:
Optimized build compiled by gcc-7.5.0 generates numerically incorrect code
Works around https://github.com/pytorch/pytorch/issues/47098
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47099
Reviewed By: walterddr
Differential Revision: D24642272
Pulled By: malfet
fbshipit-source-id: 2cfb43e950c0d1c92cfcee13749f1ad13248c39b
