better debuggers: 	- follow through segmented stacks 	- a couple of fixes to db
better debuggers:
	- follow through segmented stacks
	- a couple of fixes to db

R=rsc
DELTA=72  (62 added, 0 deleted, 10 changed)
OCL=15713
CL=15717

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