go/printer: use new reflect interface (CL 31107)
go/printer: use new reflect interface (CL 31107)

R=gri
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=31115
CL=31285
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go