go.tools/go/types: added test case for channel make
go.tools/go/types: added test case for channel make

LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://codereview.appspot.com/95910044

t-yuki/go.tools.old,t-yuki/go.tools.old,t-yuki/go.tools.old