Testing for existence of a region before accessing it in VFG._narrow_states().
Testing for existence of a region before accessing it in VFG._narrow_states().

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