erts: Refactor check_io to use one static struct
erts: Refactor check_io to use one static struct

that is shared between _kp and _nkp versions.
Makes it easier to access in debugger.

tuncer/otp,g-andrade/otp,saleyn/otp,fenollp/otp,dumbbell/otp,mikpe/otp,falkevik/otp,isvilen/otp,tuncer/otp,electricimp/otp,rlipscombe/otp,isvilen/otp,rlipscombe/otp,rlipscombe/otp,uabboli/otp,vinoski/otp,rlipscombe/otp,bernardd/otp,ferd/otp,rlipscombe/otp,saleyn/otp,jj1bdx/otp,uabboli/otp,getong/otp,rlipscombe/otp,kvakvs/otp,RaimoNiskanen/otp,bsmr-erlang/otp,potatosalad/otp,g-andrade/otp,getong/otp,RaimoNiskanen/otp,potatosalad/otp,legoscia/otp,vinoski/otp,dumbbell/otp,lrascao/otp,cobusc/otp,erlang/otp,kvakvs/otp,lrascao/otp,vinoski/otp,emacsmirror/erlang,dgud/otp,bsmr-erlang/otp,lrascao/otp,bsmr-erlang/otp,RaimoNiskanen/otp,bsmr-erlang/otp,cobusc/otp,dgud/otp,mikpe/otp,RoadRunnr/otp,emacsmirror/erlang,dumbbell/otp,dumbbell/otp,jj1bdx/otp,aboroska/otp,electricimp/otp,RaimoNiskanen/otp,bernardd/otp,fenollp/otp,getong/otp,emacsmirror/erlang,electricimp/otp,kvakvs/otp,RoadRunnr/otp,dumbbell/otp,lrascao/otp,potatosalad/otp,vladdu/otp,ferd/otp,aboroska/otp,dgud/otp,dgud/otp,RoadRunnr/otp,erlang/otp,mikpe/otp,erlang/otp,erlang/otp,bernardd/otp,isvilen/otp,fenollp/otp,potatosalad/otp,dgud/otp,potatosalad/otp,uabboli/otp,cobusc/otp,g-andrade/otp,getong/otp,ferd/otp,vinoski/otp,emacsmirror/erlang,RaimoNiskanen/otp,bjorng/otp,vinoski/otp,emacsmirror/erlang,falkevik/otp,RoadRunnr/otp,electricimp/otp,RoadRunnr/otp,legoscia/otp,RaimoNiskanen/otp,jj1bdx/otp,potatosalad/otp,cobusc/otp,legoscia/otp,aboroska/otp,RoadRunnr/otp,bernardd/otp,aboroska/otp,bernardd/otp,ferd/otp,g-andrade/otp,ferd/otp,kvakvs/otp,kvakvs/otp,kvakvs/otp,vinoski/otp,erlang/otp,rlipscombe/otp,uabboli/otp,uabboli/otp,rlipscombe/otp,uabboli/otp,bjorng/otp,tuncer/otp,potatosalad/otp,RoadRunnr/otp,bernardd/otp,mikpe/otp,ferd/otp,bernardd/otp,electricimp/otp,saleyn/otp,vinoski/otp,bjorng/otp,isvilen/otp,mikpe/otp,mikpe/otp,jj1bdx/otp,getong/otp,vladdu/otp,falkevik/otp,emacsmirror/erlang,uabboli/otp,isvilen/otp,lrascao/otp,g-andrade/otp,aboroska/otp,falkevik/otp,mikpe/otp,vladdu/otp,getong/otp,vinoski/otp,legoscia/otp,aboroska/otp,mikpe/otp,potatosalad/otp,kvakvs/otp,aboroska/otp,bsmr-erlang/otp,jj1bdx/otp,tuncer/otp,lrascao/otp,tuncer/otp,bjorng/otp,RoadRunnr/otp,bjorng/otp,dumbbell/otp,bsmr-erlang/otp,emacsmirror/erlang,getong/otp,erlang/otp,getong/otp,g-andrade/otp,jj1bdx/otp,fenollp/otp,isvilen/otp,fenollp/otp,jj1bdx/otp,legoscia/otp,kvakvs/otp,lrascao/otp,ferd/otp,fenollp/otp,jj1bdx/otp,tuncer/otp,uabboli/otp,mikpe/otp,isvilen/otp,tuncer/otp,fenollp/otp,vladdu/otp,dgud/otp,saleyn/otp,electricimp/otp,vladdu/otp,dgud/otp,uabboli/otp,emacsmirror/erlang,potatosalad/otp,g-andrade/otp,dgud/otp,saleyn/otp,erlang/otp,legoscia/otp,legoscia/otp,cobusc/otp,bjorng/otp,potatosalad/otp,g-andrade/otp,emacsmirror/erlang,bsmr-erlang/otp,erlang/otp,kvakvs/otp,dumbbell/otp,saleyn/otp,lrascao/otp,dumbbell/otp,bjorng/otp,bsmr-erlang/otp,lrascao/otp,bsmr-erlang/otp,isvilen/otp,dumbbell/otp,falkevik/otp,falkevik/otp,tuncer/otp,cobusc/otp,ferd/otp,RoadRunnr/otp,falkevik/otp,saleyn/otp,getong/otp,isvilen/otp,g-andrade/otp,jj1bdx/otp,bjorng/otp,cobusc/otp,saleyn/otp,electricimp/otp,falkevik/otp,legoscia/otp,ferd/otp,vladdu/otp,aboroska/otp,bernardd/otp,RaimoNiskanen/otp,dgud/otp,electricimp/otp,vladdu/otp,vinoski/otp,rlipscombe/otp,tuncer/otp,vladdu/otp,emacsmirror/erlang,g-andrade/otp,jj1bdx/otp,fenollp/otp,aboroska/otp,dumbbell/otp,dgud/otp,fenollp/otp,mikpe/otp,isvilen/otp,cobusc/otp,bjorng/otp,bernardd/otp,getong/otp,erlang/otp,electricimp/otp,RaimoNiskanen/otp,vladdu/otp,rlipscombe/otp,vinoski/otp,erlang/otp,bjorng/otp,falkevik/otp,saleyn/otp,RaimoNiskanen/otp,legoscia/otp