internal/gen: remove a workaround for golang.org/issue/13145. That issue has been closed. Also re-generate some tables. Change-Id: Ia0bda7464ac2d656f2b75c42babff485ca1b8ec1 Reviewed-on: https://go-review.googlesource.com/33303 Reviewed-by: Sam Whited <sam@samwhited.com> Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>