fix stash to avoid errors. faster pruning.
fix stash to avoid errors. faster pruning.

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