go.tools/go/types: check type-checker against $GOROOT/test
go.tools/go/types: check type-checker against $GOROOT/test

R=adonovan
CC=golang-dev
https://golang.org/cl/12070044

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