go.tools/go/types: added test case for channel make
go.tools/go/types: added test case for channel make

LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://golang.org/cl/95910044

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