CFGFast: remove two unused members.
CFGFast: remove two unused members.

f-prettyland/angr,iamahuman/angr,angr/angr,tyb0807/angr,chubbymaggie/angr,tyb0807/angr,schieb/angr,chubbymaggie/angr,angr/angr,angr/angr,axt/angr,haylesr/angr,tyb0807/angr,iamahuman/angr,schieb/angr,chubbymaggie/angr,f-prettyland/angr,haylesr/angr,schieb/angr,iamahuman/angr,axt/angr,axt/angr,f-prettyland/angr