Add AArch64 feature detection for FreeBSD#892

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valpackett wants to merge 2 commits intobriansmith:masterfrom valpackett:fbsd-aarch64

+79-8

Commits on Sep 1, 2019

Fix build on aarch64 on arbitrary OS (without a feature detection method)
valpackett
committed
Add CPU feature detection for FreeBSD/aarch64
valpackett
committed