CL 110355 switched out the adhoc cpu feature detection for x/sys/cpu, in doing so the AVX2 check was broken. The assembly code uses MULX which is part of BMI2. Updates golang/go#24843 Change-Id: I4719b8ff3211eb1c823099512e593e540d6f3be8 GitHub-Last-Rev: 70542b53cd09fcae26c3579cd84bcee39a4b8a57 GitHub-Pull-Request: golang/crypto#44 Reviewed-on: https://go-review.googlesource.com/110796 Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>