Added a test case for VFG (though it's not working right now).
Added a test case for VFG (though it's not working right now).

lowks/angr,f-prettyland/angr,xurantju/angr,angr/angr,lowks/angr,iamahuman/angr,axt/angr,axt/angr,angr/angr,zhuyue1314/angr,iamahuman/angr,zhuyue1314/angr,chubbymaggie/angr,cureHsu/angr,avain/angr,schieb/angr,schieb/angr,angr/angr,tyb0807/angr,tyb0807/angr,tyb0807/angr,schieb/angr,iamahuman/angr,cureHsu/angr,chubbymaggie/angr,xurantju/angr,fjferrer/angr,chubbymaggie/angr,axt/angr,haylesr/angr,mingderwang/angr,f-prettyland/angr,f-prettyland/angr,terry2012/angr,fjferrer/angr,mingderwang/angr,haylesr/angr,avain/angr,GuardianRG/angr,GuardianRG/angr,terry2012/angr