exp/gotype: disable failing tests and add a few more
exp/gotype: disable failing tests and add a few more

R=rsc, alex.brainman
CC=golang-dev
https://codereview.appspot.com/6948066

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