spec: values of underlying type uintptr can be converted to unsafe.Pointer
spec: values of underlying type uintptr can be converted to unsafe.Pointer

Not a language change, just stating the facts.

Fixes issue 1793.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/5488071

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go