added check for stack pointer
added check for stack pointer

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