[dev.cc] 9g: correct bad proginfo for ADUFFZERO and ADUFFCOPY
[dev.cc] 9g: correct bad proginfo for ADUFFZERO and ADUFFCOPY

LGTM=rsc
R=rsc, dave
CC=golang-codereviews
https://codereview.appspot.com/176130044

webfd/go-zh,d0f/go-zh,bryanxu/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,bryanxu/go-zh,d0f/go-zh