Added 'index' attribute to SimIRSB.
Added 'index' attribute to SimIRSB.

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