Added a new type of Variable: DummyVariable.
Added a new type of Variable: DummyVariable.

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