GitLab

Correctly try to detect AVX2:
https://codereview.chromium.org/869853003

CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_chromium_vista_rel_ng
R=tomfinegan@chromium.org
CC=dconnelly@chromium.org,machenbach@chromium.org,yoichio@chromium.org

Review URL: https://codereview.chromium.org/882793002

Cr-Commit-Position: refs/heads/master@{#313389}