Definition isGlobalBlock {F V : Type} (ge : Genv.t F V) :=
fun b => (fst (genv2blocksBool ge)) b || (snd (genv2blocksBool ge)) b.

(*Proof the match_genv is preserved by callsteps*)
Lemma intern_incr_meminj_preserves_globals:
forall {F V} (ge: Genv.t F V) mu
(PG: meminj_preserves_globals ge (extern_of mu) /\
(forall b, isGlobalBlock ge b = true -> frgnBlocksSrc mu b = true))
mu' (Inc: intern_incr mu mu'),
meminj_preserves_globals ge (extern_of mu') /\
(forall b, isGlobalBlock ge b = true -> frgnBlocksSrc mu' b = true).