runtime: disable pointer scan optimization   * broken by reflect, gob
runtime: disable pointer scan optimization
  * broken by reflect, gob

TBR=r
http://codereview.appspot.com/166077

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