turn gc of unused data/code back on in loaders.
turn gc of unused data/code back on in loaders.

turned it off while debugging 8 runtime problem,
checked in the change accidentally.

R=r
DELTA=4  (0 added, 0 deleted, 4 changed)
OCL=27040
CL=27046

h8liu/golang,tv42/old-go,tv42/old-go,ssrl/go,ssrl/go,ssrl/go,apparentlymart/golang,nightlyone/golang,bdwalton/debian-golang,firebitsbr/golang-old,wesolows/golang,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,bdwalton/debian-golang,pombredanne/go-deleteme,ssrl/go,dsriram/golang,firebitsbr/golang-old,wesolows/golang-old,tianon/debian-golang,ssrl/go,wesolows/golang-old,h8liu/golang,dsriram/golang,tv42/old-go,apparentlymart/golang,firebitsbr/golang-old,firebitsbr/golang-old,dsriram/golang,tianon/debian-golang,h8liu/golang,pombredanne/go-deleteme,nightlyone/golang,dsriram/golang,h8liu/golang,h8liu/golang,gnanderson/go,tianon/debian-golang,gnanderson/go,wesolows/golang-old,firebitsbr/golang-old,dsriram/golang,apparentlymart/golang,wesolows/golang,gnanderson/go,apparentlymart/golang,tv42/old-go,firebitsbr/golang-old,bdwalton/debian-golang,gnanderson/go,nightlyone/golang,nightlyone/golang,bdwalton/debian-golang,tianon/debian-golang,tv42/old-go,dsriram/golang,tv42/old-go,tianon/debian-golang,apparentlymart/golang,bdwalton/debian-golang,pombredanne/go-deleteme,h8liu/golang,tianon/debian-golang,ssrl/go,ssrl/go,h8liu/golang,bdwalton/debian-golang,tianon/debian-golang,gnanderson/go,wesolows/golang,gnanderson/go,nightlyone/golang,pombredanne/go-deleteme,nightlyone/golang,wesolows/golang-old,wesolows/golang,wesolows/golang-old,tianon/debian-golang,wesolows/golang,firebitsbr/golang-old,pombredanne/go-deleteme,apparentlymart/golang,firebitsbr/golang-old,wesolows/golang,wesolows/golang,bdwalton/debian-golang,wesolows/golang-old,nightlyone/golang,dsriram/golang,bdwalton/debian-golang,pombredanne/go-deleteme,wesolows/golang-old,gnanderson/go