encoding/gob: do not hide pointer argument for the garbage collector
encoding/gob: do not hide pointer argument for the garbage collector

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/14154043

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