Add/use chunk_decommit_wrapper().

src/chunk.c

@@ -752,6 +752,15 @@ chunk_decommit_default(void *chunk, size_t size, size_t offset, size_t length,
 	    length));
 }
 
+bool
+chunk_decommit_wrapper(tsdn_t *tsdn, arena_t *arena, chunk_hooks_t *chunk_hooks,
+    void *chunk, size_t size, size_t offset, size_t length)
+{
+
+	chunk_hooks_assure_initialized(tsdn, arena, chunk_hooks);
+	return (chunk_hooks->decommit(chunk, size, offset, length, arena->ind));
+}
+
 static bool
 chunk_purge_default(void *chunk, size_t size, size_t offset, size_t length,
     unsigned arena_ind)