perf(library/module): do not use multiple threads when skipping type checking, add flag to disable/enable type checking theorems asynchronously
perf(library/module): do not use multiple threads when skipping type checking, add flag to disable/enable type checking theorems asynchronously

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

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