Add missing heap_lang/adequacy.

heap_lang/adequacy.v

+From iris.program_logic Require Export weakestpre adequacy.
+From iris.heap_lang Require Export heap.
+From iris.program_logic Require Import auth ownership.
+From iris.heap_lang Require Import proofmode notation.
+From iris.proofmode Require Import tactics weakestpre.
+
+Definition heapGF : gFunctorList := [authGF heapUR; irisGF heap_lang].
+
+Definition heap_adequacy Σ `{irisPreG heap_lang Σ, authG Σ heapUR} e σ φ :
+  (∀ `{heapG Σ}, heap_ctx ⊢ WP e {{ v, ■ φ v }}) →
+  adequate e σ φ.
+Proof.
+  intros Hwp; eapply (wp_adequacy Σ); iIntros (?) "Hσ".
+  iVs (auth_alloc (ownP ∘ of_heap) heapN _ (to_heap σ) with "[Hσ]") as (γ) "[??]".
+  - auto using to_heap_valid.
+  - rewrite /= (from_to_heap σ); auto.
+  - iApply (Hwp (HeapG _ _ _ γ)). by rewrite /heap_ctx.
+Qed.
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