s_state: copy the arch when we copy the state
s_state: copy the arch when we copy the state

The x86_cr0 in vex_archinfo in the arch can be modified, so we don't
want to affect the original state if we modify the copy of this state
(or the other way around).

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