test: Recognize gccgo error messages.
test: Recognize gccgo error messages.

bug255.go:11: error: array bound truncated to integer
bug255.go:12: error: array bound is not numeric
bug255.go:13: error: array bound is not numeric
bug255.go:14: error: array bound is not constant
bug255.go:15: error: array bound overflows

R=rsc
CC=golang-dev
http://codereview.appspot.com/2091042

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