test: match gccgo error messages for bug016.go.
test: match gccgo error messages for bug016.go.

bug016.go:11:8: error: negative shift count

R=rsc, gri
CC=golang-dev
http://codereview.appspot.com/4312055

dsriram/golang,ssrl/go,tv42/old-go,ssrl/go,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,ssrl/go,dsriram/golang,pombredanne/go-deleteme,ssrl/go,dsriram/golang,ssrl/go,dsriram/golang,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,gnanderson/go,ssrl/go,dsriram/golang,gnanderson/go,apparentlymart/golang,tv42/old-go,tv42/old-go,dsriram/golang,dsriram/golang,gnanderson/go