go/ssa/interp: disable interpretation of packages that have sprouted Examples
go/ssa/interp: disable interpretation of packages that have sprouted Examples

since we can't interpret os.Pipe yet.

Change-Id: If27dadc18532274ce97ad7e7557e8614dd15279e
Reviewed-on: https://go-review.googlesource.com/11712
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

sshetty10/tools,cw2018/tools,jdhenke/tools,jdhenke/tools,golang/tools,argandas/tools,sshetty10/tools,runcom/tools,cmars/tools,runcom/tools,argandas/tools,cw2018/tools,glasser/golang-tools,magiccao/tools,matryer/tools,sshetty10/tools,syreclabs/go-tools,golang/tools,springning/tools,runcom/tools,cw2018/tools,jdhenke/tools,syreclabs/go-tools,josharian/tools,cw2018/tools,syreclabs/go-tools,runcom/tools,cmars/tools,golang/tools,jdhenke/tools,cmars/tools,argandas/tools,syreclabs/go-tools,sshetty10/tools,syreclabs/go-tools,magiccao/tools,josharian/tools,magiccao/tools,springning/tools,glasser/golang-tools,josharian/tools,josharian/tools,nicot/tools,nicot/tools,springning/tools,golang/tools,matryer/tools,argandas/tools,glasser/golang-tools,glasser/golang-tools,nicot/tools,magiccao/tools,matryer/tools,matryer/tools,nicot/tools,golang/tools,cmars/tools,syreclabs/go-tools,springning/tools