sys_core_fold: Simplify opt_simple_let_2/6
sys_core_fold: Simplify opt_simple_let_2/6

In cd1eaf0116190, opt_simple_let_2/6 was updated to do the same
optimizations in 'value' and 'effect' context.

Coalesce the clauses for 'value' and 'effect' context to one to
make it clear that they do the same thing.

awetzel/otp,VincentHHL/otp,vladdu/otp,emacsmirror/erlang,cobusc/otp,lucafavatella/otp,beni55/otp,lucafavatella/otp,c-rack/otp,getong/otp,haguenau/otp,psyeugenic/otp,cobusc/otp,c-rack/otp,cobusc/otp,RoadRunnr/otp,RaimoNiskanen/otp,dgud/otp,weisslj/otp,matwey/otp,weisslj/otp,entropiae/otp,fenollp/otp,isvilen/otp,jamesruan/otp,lianghaivv/otp,goertzenator/otp,emacsmirror/erlang,lianghaivv/otp,NOMORECOFFEE/otp,matwey/otp,derek121/otp,vic/otp,c-rack/otp,platinumthinker/otp,enikki/otp,ahmedshafeeq/otp,release-project/otp,falkevik/otp,bjorng/otp,haguenau/otp,yangchengjian/otp,bernardd/otp,jj1bdx/otp,release-project/otp,cnbin/otp,basho/otp,erlang/otp,g-andrade/otp,lianghaivv/otp,c-rack/otp,jemsbhai/otp,jemsbhai/otp,hairyhum/otp,ferd/otp,riverrun/otp,psyeugenic/otp,goertzenator/otp,lightcyphers/otp,uabboli/otp,stolen/otp,VincentHHL/otp,klarna/otp,fenollp/otp,RJ/otp,benoitc/otp-1,getong/otp,basho/otp,vinoski/otp,bjorng/otp,johanclaesson/otp,emile/otp,lrascao/otp,RichMorin/otp,ahmedshafeeq/otp,mikpe/otp,mujiatong/otp,marquisthunder/otp,Teino1978-Corp/erlang-otp,sammoth-wazoku/otp,theom/otp,klarna/otp,dumbbell/otp,VincentHHL/otp,lightcyphers/otp,bsmr-erlang/otp,weisslj/otp,mikpe/otp,jemsbhai/otp,jj1bdx/otp,isvilen/otp,fenollp/otp,lrascao/otp,goertzenator/otp,hairyhum/otp,lemenkov/otp,sitexa/otp,lhslll/otp,krishnakumar4a4/otp,emacsmirror/erlang,riverrun/otp,sdebnath/otp,falkevik/otp,release-project/otp,RoadRunnr/otp,NOMORECOFFEE/otp,jinshana/otp,bugs-erlang-org/otp,emacsmirror/erlang,potatosalad/otp,lantti/otp,saleyn/otp,NOMORECOFFEE/otp,mikpe/otp,schlagert/otp,Teino1978-Corp/otp,g-andrade/otp,msantos/otp,palas/otp,sdebnath/otp,RJ/otp,lantti/otp,hairyhum/otp,vladdu/otp,legoscia/otp,lightcyphers/otp,falkevik/otp,msantos/otp,awetzel/otp,marquisthunder/otp,electricimp/otp,lhslll/otp,enikki/otp,jinshana/otp,legoscia/otp,RoadRunnr/otp,massemanet/otp,schlagert/otp,haguenau/otp,bjorng/otp,lightcyphers/otp,release-project/otp,VincentHHL/otp,entropiae/otp,lrascao/otp,tuncer/otp,neeraj9/otp,goertzenator/otp,lantti/otp,Teino1978-Corp/erlang-otp,sdebnath/otp,paladim/otp,stolen/otp,neeraj9/otp,lrascao/otp,Teino1978-Corp/erlang-otp,lemenkov/otp,NOMORECOFFEE/otp,kvakvs/otp,awetzel/otp,isvilen/otp,platinumthinker/otp,weisslj/otp,awetzel/otp,tuncer/otp,ahmedshafeeq/otp,bugs-erlang-org/otp,jj1bdx/otp,vinoski/otp,krishnakumar4a4/otp,paulcager/otp,lantti/otp,RichMorin/otp,klarna/otp,getong/otp,goertzenator/otp,msantos/otp,neeraj9/otp,bsmr-erlang/otp,schlagert/otp,isvilen/otp,isvilen/otp,release-project/otp,jemsbhai/otp,ader1990/otp,release-project/otp,lantti/otp,uabboli/otp,schlagert/otp,matwey/otp,enikki/otp,ahmedshafeeq/otp,RJ/otp,platinumthinker/otp,isvilen/otp,GinjaNinja32/otp,legoscia/otp,getong/otp,dumbbell/otp,marquisthunder/otp,sdebnath/otp,schlagert/otp,haguenau/otp,yangchengjian/otp,dgud/otp,RaimoNiskanen/otp,tuncer/otp,emacsmirror/erlang,getong/otp,basho/otp,legoscia/otp,lianghaivv/otp,mikpe/otp,tuncer/otp,hairyhum/otp,jj1bdx/otp,jj1bdx/otp,GinjaNinja32/otp,c-rack/otp,Teino1978-Corp/otp,aboroska/otp,Teino1978-Corp/otp,klarna/otp,sdebnath/otp,legoscia/otp,jj1bdx/otp,RJ/otp,neeraj9/otp,GinjaNinja32/otp,dumbbell/otp,GinjaNinja32/otp,lucafavatella/otp,falkevik/otp,c-rack/otp,lemenkov/otp,klarna/otp,potatosalad/otp,cobusc/otp,neeraj9/otp,cobusc/otp,derek121/otp,erlang/otp,ferd/otp,psyeugenic/otp,RaimoNiskanen/otp,lianghaivv/otp,mujiatong/otp,tuncer/otp,yangchengjian/otp,paulcager/otp,sitexa/otp,lantti/otp,RaimoNiskanen/otp,ferd/otp,msantos/otp,legoscia/otp,uabboli/otp,emile/otp,RaimoNiskanen/otp,goertzenator/otp,lrascao/otp,NOMORECOFFEE/otp,jinshana/otp,vinoski/otp,psyeugenic/otp,sdebnath/otp,riverrun/otp,cnbin/otp,emacsmirror/erlang,lucafavatella/otp,enikki/otp,vinoski/otp,vladdu/otp,aboroska/otp,c-rack/otp,bernardd/otp,saleyn/otp,mujiatong/otp,lemenkov/otp,johanclaesson/otp,gjaldon/otp,ader1990/otp,yangchengjian/otp,potatosalad/otp,riverrun/otp,vladdu/otp,release-project/otp,emacsmirror/erlang,lhslll/otp,yangchengjian/otp,ahmedshafeeq/otp,enikki/otp,GinjaNinja32/otp,goertzenator/otp,falkevik/otp,palas/otp,RaimoNiskanen/otp,ferd/otp,bsmr-erlang/otp,sitexa/otp,johanclaesson/otp,dumbbell/otp,marquisthunder/otp,paulcager/otp,ferd/otp,neeraj9/otp,stolen/otp,g-andrade/otp,getong/otp,msantos/otp,gjaldon/otp,kvakvs/otp,saleyn/otp,bugs-erlang-org/otp,entropiae/otp,jamesruan/otp,beni55/otp,vladdu/otp,rlipscombe/otp,bjorng/otp,uabboli/otp,RJ/otp,erlang/otp,enikki/otp,massemanet/otp,hairyhum/otp,paladim/otp,ahmedshafeeq/otp,riverrun/otp,kvakvs/otp,gjaldon/otp,platinumthinker/otp,electricimp/otp,dumbbell/otp,vinoski/otp,RGafiyatullin/otp,matwey/otp,electricimp/otp,lemenkov/otp,palas/otp,lightcyphers/otp,fenollp/otp,bernardd/otp,lemenkov/otp,saleyn/otp,dgud/otp,neeraj9/otp,paulcager/otp,ahmedshafeeq/otp,fenollp/otp,benoitc/otp-1,aboroska/otp,sammoth-wazoku/otp,benoitc/otp-1,g-andrade/otp,awetzel/otp,VincentHHL/otp,cnbin/otp,sitexa/otp,bsmr-erlang/otp,cobusc/otp,g-andrade/otp,massemanet/otp,bernardd/otp,erlang/otp,schlagert/otp,vic/otp,sitexa/otp,beni55/otp,RichMorin/otp,basho/otp,g-andrade/otp,RichMorin/otp,weisslj/otp,theom/otp,rlipscombe/otp,marquisthunder/otp,ferd/otp,emile/otp,hairyhum/otp,lrascao/otp,Teino1978-Corp/erlang-otp,riverrun/otp,theom/otp,palas/otp,tuncer/otp,lantti/otp,vic/otp,lhslll/otp,lightcyphers/otp,falkevik/otp,jemsbhai/otp,mujiatong/otp,paulcager/otp,goertzenator/otp,stolen/otp,bsmr-erlang/otp,basho/otp,matwey/otp,vladdu/otp,dgud/otp,sdebnath/otp,jj1bdx/otp,vladdu/otp,fenollp/otp,rlipscombe/otp,erlang/otp,RGafiyatullin/otp,bugs-erlang-org/otp,erlang/otp,VincentHHL/otp,riverrun/otp,palas/otp,jamesruan/otp,potatosalad/otp,dgud/otp,electricimp/otp,jamesruan/otp,RoadRunnr/otp,RGafiyatullin/otp,falkevik/otp,aboroska/otp,fenollp/otp,emile/otp,potatosalad/otp,yangchengjian/otp,msantos/otp,mujiatong/otp,RichMorin/otp,bugs-erlang-org/otp,vladdu/otp,mikpe/otp,RJ/otp,NOMORECOFFEE/otp,Teino1978-Corp/otp,lrascao/otp,sitexa/otp,awetzel/otp,klarna/otp,krishnakumar4a4/otp,vic/otp,platinumthinker/otp,GinjaNinja32/otp,g-andrade/otp,msantos/otp,RGafiyatullin/otp,sitexa/otp,electricimp/otp,cnbin/otp,jj1bdx/otp,vic/otp,RoadRunnr/otp,GinjaNinja32/otp,riverrun/otp,dgud/otp,RoadRunnr/otp,Teino1978-Corp/erlang-otp,jj1bdx/otp,paladim/otp,lhslll/otp,RGafiyatullin/otp,legoscia/otp,uabboli/otp,RGafiyatullin/otp,paladim/otp,rlipscombe/otp,ader1990/otp,falkevik/otp,RichMorin/otp,paulcager/otp,benoitc/otp-1,emile/otp,marquisthunder/otp,isvilen/otp,matwey/otp,rlipscombe/otp,fenollp/otp,sitexa/otp,johanclaesson/otp,ader1990/otp,RoadRunnr/otp,bjorng/otp,derek121/otp,weisslj/otp,krishnakumar4a4/otp,klarna/otp,lucafavatella/otp,bernardd/otp,theom/otp,mikpe/otp,dumbbell/otp,yangchengjian/otp,platinumthinker/otp,ferd/otp,electricimp/otp,entropiae/otp,massemanet/otp,schlagert/otp,hairyhum/otp,basho/otp,sammoth-wazoku/otp,sammoth-wazoku/otp,emacsmirror/erlang,benoitc/otp-1,johanclaesson/otp,psyeugenic/otp,psyeugenic/otp,Teino1978-Corp/otp,dgud/otp,entropiae/otp,lucafavatella/otp,cobusc/otp,saleyn/otp,bernardd/otp,tuncer/otp,haguenau/otp,lhslll/otp,erlang/otp,msantos/otp,bjorng/otp,basho/otp,dumbbell/otp,lucafavatella/otp,NOMORECOFFEE/otp,lrascao/otp,electricimp/otp,Teino1978-Corp/otp,GinjaNinja32/otp,VincentHHL/otp,bernardd/otp,palas/otp,yangchengjian/otp,jamesruan/otp,bernardd/otp,ader1990/otp,ahmedshafeeq/otp,enikki/otp,dumbbell/otp,johanclaesson/otp,jemsbhai/otp,derek121/otp,gjaldon/otp,platinumthinker/otp,krishnakumar4a4/otp,massemanet/otp,haguenau/otp,psyeugenic/otp,beni55/otp,potatosalad/otp,paladim/otp,krishnakumar4a4/otp,rlipscombe/otp,bernardd/otp,emacsmirror/erlang,lemenkov/otp,paladim/otp,mikpe/otp,vinoski/otp,palas/otp,vinoski/otp,emacsmirror/erlang,johanclaesson/otp,Teino1978-Corp/erlang-otp,emile/otp,beni55/otp,fenollp/otp,cnbin/otp,emile/otp,weisslj/otp,krishnakumar4a4/otp,potatosalad/otp,marquisthunder/otp,beni55/otp,sammoth-wazoku/otp,VincentHHL/otp,rlipscombe/otp,jamesruan/otp,cnbin/otp,hairyhum/otp,derek121/otp,legoscia/otp,g-andrade/otp,electricimp/otp,theom/otp,mujiatong/otp,basho/otp,ferd/otp,lianghaivv/otp,bugs-erlang-org/otp,kvakvs/otp,krishnakumar4a4/otp,jinshana/otp,lianghaivv/otp,cnbin/otp,isvilen/otp,bjorng/otp,erlang/otp,mujiatong/otp,ader1990/otp,beni55/otp,sammoth-wazoku/otp,entropiae/otp,gjaldon/otp,mikpe/otp,RJ/otp,jinshana/otp,erlang/otp,lianghaivv/otp,jemsbhai/otp,awetzel/otp,massemanet/otp,paulcager/otp,psyeugenic/otp,electricimp/otp,potatosalad/otp,paladim/otp,aboroska/otp,emile/otp,beni55/otp,klarna/otp,matwey/otp,weisslj/otp,bsmr-erlang/otp,entropiae/otp,lightcyphers/otp,schlagert/otp,derek121/otp,getong/otp,palas/otp,entropiae/otp,mikpe/otp,jamesruan/otp,uabboli/otp,release-project/otp,saleyn/otp,cobusc/otp,aboroska/otp,kvakvs/otp,marquisthunder/otp,gjaldon/otp,RichMorin/otp,potatosalad/otp,ader1990/otp,Teino1978-Corp/otp,dumbbell/otp,stolen/otp,ader1990/otp,bsmr-erlang/otp,bjorng/otp,potatosalad/otp,gjaldon/otp,getong/otp,vinoski/otp,sammoth-wazoku/otp,aboroska/otp,uabboli/otp,sammoth-wazoku/otp,bugs-erlang-org/otp,g-andrade/otp,saleyn/otp,matwey/otp,uabboli/otp,release-project/otp,NOMORECOFFEE/otp,Teino1978-Corp/erlang-otp,RoadRunnr/otp,kvakvs/otp,massemanet/otp,enikki/otp,bjorng/otp,johanclaesson/otp,uabboli/otp,haguenau/otp,bugs-erlang-org/otp,rlipscombe/otp,stolen/otp,isvilen/otp,ahmedshafeeq/otp,dgud/otp,lrascao/otp,getong/otp,tuncer/otp,lhslll/otp,dumbbell/otp,c-rack/otp,vinoski/otp,RoadRunnr/otp,benoitc/otp-1,RGafiyatullin/otp,RaimoNiskanen/otp,ferd/otp,theom/otp,legoscia/otp,haguenau/otp,jamesruan/otp,RichMorin/otp,theom/otp,dgud/otp,bsmr-erlang/otp,kvakvs/otp,lucafavatella/otp,awetzel/otp,vinoski/otp,jemsbhai/otp,paladim/otp,vic/otp,benoitc/otp-1,saleyn/otp,aboroska/otp,emile/otp,goertzenator/otp,benoitc/otp-1,RJ/otp,RaimoNiskanen/otp,neeraj9/otp,cnbin/otp,falkevik/otp,lantti/otp,vladdu/otp,kvakvs/otp,vic/otp,lhslll/otp,lemenkov/otp,g-andrade/otp,dgud/otp,theom/otp,getong/otp,gjaldon/otp,massemanet/otp,stolen/otp,mikpe/otp,Teino1978-Corp/erlang-otp,jinshana/otp,matwey/otp,saleyn/otp,jj1bdx/otp,mujiatong/otp,aboroska/otp,sdebnath/otp,jinshana/otp,basho/otp,isvilen/otp,bjorng/otp,platinumthinker/otp,vic/otp,derek121/otp,rlipscombe/otp,Teino1978-Corp/otp,massemanet/otp,RaimoNiskanen/otp,lightcyphers/otp,derek121/otp,weisslj/otp,erlang/otp,kvakvs/otp,jinshana/otp,RGafiyatullin/otp,bsmr-erlang/otp,rlipscombe/otp,stolen/otp,tuncer/otp,paulcager/otp