Merge branch 'ag/p3400-force-checkout'

Perf test tweak. * ag/p3400-force-checkout: p3400: replace calls to `git checkout -b' by `git checkout -B'

Junio C Hamano committed Nov 18, 2018 at 18:23 UTC 0466aebd3a195ded2731cc3b60c44f664fe00a65

No changes.