feat(library/data/empty): add false.to_empty and false.rec_type theorems
feat(library/data/empty): add false.to_empty and false.rec_type theorems

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

fpvandoorn/lean,leanprover-community/lean,leanprover-community/lean,dselsam/lean,c-cube/lean,c-cube/lean,levnach/lean,UlrikBuchholtz/lean,c-cube/lean,levnach/lean,fpvandoorn/lean,soonhokong/lean,dselsam/lean,UlrikBuchholtz/lean,fgdorais/lean,fpvandoorn/lean2,avigad/lean,fgdorais/lean,johoelzl/lean,leanprover/lean,fpvandoorn/lean2,leodemoura/lean,soonhokong/lean-windows,fgdorais/lean,soonhokong/lean-windows,soonhokong/lean,fpvandoorn/lean,fgdorais/lean,digama0/lean,Kha/lean,digama0/lean,dselsam/lean,Kha/lean,soonhokong/lean,avigad/lean,digama0/lean,johoelzl/lean,rlewis1988/lean,UlrikBuchholtz/lean,leanprover/lean,soonhokong/lean-windows,soonhokong/lean,htzh/lean,fpvandoorn/lean2,Kha/lean,c-cube/lean,leanprover/lean,avigad/lean,soonhokong/lean-osx,sp3ctum/lean,leanprover-community/lean,rlewis1988/lean,leanprover-community/lean,fgdorais/lean,levnach/lean,digama0/lean,leanprover-community/lean,fgdorais/lean,avigad/lean,johoelzl/lean,johoelzl/lean,rlewis1988/lean,leodemoura/lean,dselsam/lean,rlewis1988/lean,digama0/lean,sp3ctum/lean,leodemoura/lean,dselsam/lean,javra/lean,sp3ctum/lean,sp3ctum/lean,Kha/lean,leanprover/lean,Kha/lean,digama0/lean,fpvandoorn/lean2,levnach/lean,UlrikBuchholtz/lean,dselsam/lean,levnach/lean,javra/lean,leanprover-community/lean,javra/lean,soonhokong/lean-osx,eigengrau/lean,leodemoura/lean,leanprover/lean,c-cube/lean,leanprover/lean,htzh/lean,leodemoura/lean,fpvandoorn/lean2,eigengrau/lean,eigengrau/lean,soonhokong/lean-windows,fpvandoorn/lean,sp3ctum/lean,Kha/lean,leodemoura/lean,soonhokong/lean-osx,rlewis1988/lean,johoelzl/lean,javra/lean,fpvandoorn/lean,johoelzl/lean,soonhokong/lean-osx,avigad/lean,javra/lean,eigengrau/lean,fpvandoorn/lean,soonhokong/lean-osx,eigengrau/lean,UlrikBuchholtz/lean,soonhokong/lean-windows,htzh/lean,avigad/lean,htzh/lean,soonhokong/lean,htzh/lean,rlewis1988/lean