port updates from poly/polysat

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/util/dlist.h

@@ -223,6 +223,16 @@ class dll_iterator {
     }
 };
 
+template <typename T>
+class dll_elements {
+    T const* m_list;
+public:
+    dll_elements(T const* list) : m_list(list) {}
+    dll_iterator<T> begin() const { return dll_iterator<T>::mk_begin(m_list); }
+    dll_iterator<T> end() const { return dll_iterator<T>::mk_end(m_list); }
+};
+
+
 template < typename T
          , typename U = std::enable_if_t<std::is_base_of_v<dll_base<T>, T>>  // should only match if T actually inherits from dll_base<T>
          >

src/util/var_queue.h

@@ -68,6 +68,8 @@ class var_queue {
     void reset() {
         m_queue.reset();
     }
+
+    bool contains(var v) const { return m_queue.contains(v); }
 
     bool empty() const { return m_queue.empty(); }