fix backtrace of merged paths in Veritesting.
fix backtrace of merged paths in Veritesting.

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