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

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang