BlockArena, a bit of allocator rework

src/basic/basic_table.h

@@ -51,7 +51,9 @@ struct HashTable {
 
         Assert(!(old_values == 0 && len != 0));
         if (len == 0) {
-            if (old_values) Dealloc(allocator, &old_values);
+            if (old_values) {
+                Dealloc(allocator, old_values);
+            }
             return;
         }
 
@@ -62,7 +64,7 @@ struct HashTable {
                 insert(it->key, it->value);
             }
         }
-        Dealloc(allocator, &old_values);
+        Dealloc(allocator, old_values);
     }
 
     Entry *get_table_entry(uint64_t key) {
@@ -177,7 +179,8 @@ struct HashTable {
     }
 
     void dealloc() {
-        Dealloc(allocator, &values);
+        Dealloc(allocator, values);
+        values = NULL;
         len = 0;
         cap = 0;
     }