erts: Remove dead ERTS_MAGIC_REF_BIF_TIMERS code
erts: Remove dead ERTS_MAGIC_REF_BIF_TIMERS code

Using magic refs for big timers caused too large a stress on
the off_heap GC implementation to be viable, so it was never
enable. The code is now broken because of other changes to
we might as well remove it.

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