feat(order/conditionally_complete_lattice): Make cSup_empty a simp lemma (#13318)

Author: vihdzp

src/order/conditionally_complete_lattice.lean

@@ -674,10 +674,10 @@ section conditionally_complete_linear_order_bot
 
 variables [conditionally_complete_linear_order_bot α]
 
-lemma cSup_empty : (Sup ∅ : α) = ⊥ :=
+@[simp] lemma cSup_empty : (Sup ∅ : α) = ⊥ :=
 conditionally_complete_linear_order_bot.cSup_empty
 
-lemma csupr_of_empty [is_empty ι] (f : ι → α) : (⨆ i, f i) = ⊥ :=
+@[simp] lemma csupr_of_empty [is_empty ι] (f : ι → α) : (⨆ i, f i) = ⊥ :=
 by rw [supr_of_empty', cSup_empty]
 
 @[simp] lemma csupr_false (f : false → α) : (⨆ i, f i) = ⊥ := csupr_of_empty f