feat(compiler/lambda_lifting): try to reduce cases_on after major premise has been processed
feat(compiler/lambda_lifting): try to reduce cases_on after major premise has been processed

digama0/lean,avigad/lean,leodemoura/lean,fgdorais/lean,leanprover/lean,fgdorais/lean,soonhokong/lean-windows,fgdorais/lean,johoelzl/lean,digama0/lean,soonhokong/lean-osx,soonhokong/lean-osx,Kha/lean,leodemoura/lean,fgdorais/lean,avigad/lean,rlewis1988/lean,fpvandoorn/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover/lean,rlewis1988/lean,rlewis1988/lean,dselsam/lean,fpvandoorn/lean,dselsam/lean,leanprover-community/lean,leanprover-community/lean,Kha/lean,rlewis1988/lean,Kha/lean,avigad/lean,leanprover/lean,soonhokong/lean-windows,fgdorais/lean,johoelzl/lean,fgdorais/lean,leodemoura/lean,leanprover-community/lean,digama0/lean,avigad/lean,johoelzl/lean,leanprover-community/lean,leanprover-community/lean,soonhokong/lean-windows,soonhokong/lean-osx,fpvandoorn/lean,johoelzl/lean,leodemoura/lean,dselsam/lean,Kha/lean,digama0/lean,avigad/lean,digama0/lean,soonhokong/lean-windows,rlewis1988/lean,dselsam/lean,rlewis1988/lean,leanprover/lean,fpvandoorn/lean,leanprover-community/lean,leodemoura/lean,avigad/lean,digama0/lean,Kha/lean,soonhokong/lean-osx,Kha/lean,johoelzl/lean,leodemoura/lean,johoelzl/lean,soonhokong/lean-windows,leanprover/lean,leanprover/lean,dselsam/lean,dselsam/lean,soonhokong/lean-osx