cmd/go: write the WORK=/tmp/... line to stderr Unlike the other output from the -x flag, it was going to stdout. Fixes issue 6362.
cmd/go: write the WORK=/tmp/... line to stderr
Unlike the other output from the -x flag, it was going to stdout.
Fixes issue 6362.

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/13746044

wesolows/golang,firebitsbr/golang-old,wesolows/golang,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang,wesolows/golang