cmd/fix: disable reflect test under race detector (very slow)
cmd/fix: disable reflect test under race detector (very slow)

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/6642045
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go