added test for memory copying and symbolic-lengthed reads
added test for memory copying and symbolic-lengthed reads

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