cmd/preprofile: correct -V flag
Change-Id: I9a0dc3a4b4c81f0f6942badcd4643a74c5046440
GitHub-Last-Rev:
d1fa4e51569b1b1b70e4617ac41740cc21d4325a
GitHub-Pull-Request: golang/go#66949
Reviewed-on: https://go-review.googlesource.com/c/go/+/580615
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Veronica Silina <veronicasilina@google.com>