added a prepare_state() method in SimArch
added a prepare_state() method in SimArch

axt/angr,schieb/angr,f-prettyland/angr,angr/angr,f-prettyland/angr,f-prettyland/angr,angr/simuvex,chubbymaggie/simuvex,schieb/angr,axt/angr,chubbymaggie/angr,tyb0807/angr,iamahuman/angr,chubbymaggie/simuvex,tyb0807/angr,chubbymaggie/simuvex,axt/angr,schieb/angr,angr/angr,angr/angr,iamahuman/angr,tyb0807/angr,chubbymaggie/angr,zhuyue1314/simuvex,chubbymaggie/angr,iamahuman/angr