spec: additional composite literal shortenings per Go 1 plan
spec: additional composite literal shortenings per Go 1 plan

R=golang-dev, gri, r, r
CC=golang-dev
http://codereview.appspot.com/5449067

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang