fixed register usage and removed some dead code.
fixed register usage and removed some dead code.

R=rsc
APPROVED=rsc
DELTA=17  (0 added, 12 deleted, 5 changed)
OCL=34659
CL=34665

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