runtime-gdb.py: gdb pretty printer for go strings properly handles length.
runtime-gdb.py: gdb pretty printer for go strings properly handles length.

R=rsc, r2
CC=golang-dev
http://codereview.appspot.com/4183060

apparentlymart/golang,pombredanne/go-deleteme,ssrl/go,tv42/old-go,dsriram/golang,tv42/old-go,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,gnanderson/go,gnanderson/go,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,ssrl/go,pombredanne/go-deleteme,ssrl/go,tv42/old-go,ssrl/go,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,ssrl/go,tv42/old-go,dsriram/golang,ssrl/go,ssrl/go,dsriram/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,dsriram/golang,gnanderson/go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,gnanderson/go,gnanderson/go