misc/benchcmp: benchmark comparison script
misc/benchcmp: benchmark comparison script

I've been using this since April and posted it on the
mailing list, but it seems worth having in the repository.
Not sure about the location.

R=golang-dev, r, r
CC=golang-dev
http://codereview.appspot.com/5371100
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go