dfg: ensure that the optimized tmp node has the same tmp nb
dfg: ensure that the optimized tmp node has the same tmp nb

Otherwise with something like
t3 = t2
PUT(eax) = t3

We will have

PUT(eax) = t3

and t3 does not exist

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