go.tools/go/types: enable more std lib tests
go.tools/go/types: enable more std lib tests

R=adonovan
CC=golang-dev
https://golang.org/cl/13798043

nicot/tools,cw2018/tools,cw2018/tools,nicot/tools,dmitris/tools,magiccao/tools,jdhenke/tools,golang/tools,runcom/tools,argandas/tools,runcom/tools,matryer/tools,josharian/tools,josharian/tools,cmars/tools,golang/tools,glasser/golang-tools,runcom/tools,springning/tools,springning/tools,springning/tools,maddyonline/tools,dmitris/tools,syreclabs/go-tools,4ad/tools,syreclabs/go-tools,sshetty10/tools,springning/tools,jdhenke/tools,dmitris/tools,4ad/tools,matryer/tools,dmitris/tools,sshetty10/tools,maddyonline/tools,argandas/tools,matryer/tools,cw2018/tools,syreclabs/go-tools,runcom/tools,glasser/golang-tools,syreclabs/go-tools,glasser/golang-tools,matryer/tools,cmars/tools,golang/tools,syreclabs/go-tools,4ad/tools,josharian/tools,cmars/tools,cmars/tools,nicot/tools,magiccao/tools,maddyonline/tools,magiccao/tools,golang/tools,syreclabs/go-tools,josharian/tools,glasser/golang-tools,maddyonline/tools,argandas/tools,sshetty10/tools,jdhenke/tools,argandas/tools,nicot/tools,sshetty10/tools,cw2018/tools,magiccao/tools,jdhenke/tools,golang/tools