Make sure strings are interpreted as unsigned literals in concat
Make sure strings are interpreted as unsigned literals in concat

--HG--
branch : 0.8-dev

gw0/myhdl,myhdl/myhdl,juhasch/myhdl,palashahuja/myhdl,myhdl/myhdl,j-marjanovic/myhdl,cfelton/myhdl,josyb/myhdl,j-marjanovic/myhdl,jandecaluwe/myhdl,jmgc/myhdl-numeric,palashahuja/myhdl,cfelton/myhdl,josyb/myhdl,hgomersall/myhdl,jck/myhdl,josyb/myhdl,jandecaluwe/myhdl,j-marjanovic/myhdl,hgomersall/myhdl,myhdl/myhdl,palashahuja/myhdl,jmgc/myhdl-numeric,jmgc/myhdl-numeric,juhasch/myhdl,juhasch/myhdl,cfelton/myhdl,jck/myhdl,jandecaluwe/myhdl,hgomersall/myhdl,gw0/myhdl,gw0/myhdl,palashahuja/myhdl,jck/myhdl