cmd/compilebench: make StdCmd respect compiler flags flag

Change-Id: I9230492805583092c52ccc87e3be7740ba794c3f
Reviewed-on: https://go-review.googlesource.com/40652
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed