runtime: markfreed's error reports should be prefixed with "markfreed", not "markallocated".
runtime: markfreed's error reports should be prefixed with "markfreed", not "markallocated".

R=golang-dev, iant
CC=golang-dev
https://codereview.appspot.com/14441055

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