go/types: export data result types are always parenthesized
go/types: export data result types are always parenthesized

Minor simplification of gcimporter, removed TODO.

R=adonovan
CC=golang-dev
https://codereview.appspot.com/7363044
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go