VariableRecovery: support parsing __add__ and __sub__ with more than two arguments.
VariableRecovery: support parsing __add__ and __sub__ with more than two arguments.

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