added support for arch_prctl was writing the value of gs to addr when it should have been fs
added support for arch_prctl was writing the value of gs to addr when it should have been fs

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