Speed up beam_ssa_dead
Speed up beam_ssa_dead

Compilation of code similar the following would be very slow:

    uts46_map(CP) when 0 =< CP, CP =< 44 -> '3';
    uts46_map(CP) when 45 =< CP, CP =< 46 -> 'V';
    uts46_map(CP) when 48 =< CP, CP =< 57 -> 'V';
    %% More than 2500 similar lines follows.
      .
      .
      .

The code is from from:

https://github.com/benoitc/erlang-idna/blob/3eb54ccbfa6fb917c0f4ca9197da337ad888ffe0/src/idna_mapping.erl#L6780

By using information about skippable blocks, the beam_ssa_dead
pass can be sped up to compile idna_mapping.erl about 10 times faster.

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