improve the detection of whether or not basic blocks changed
improve the detection of whether or not basic blocks changed

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