add array selects to basic ackerman reduction improves performance significantly for #2525 as it now uses the SAT solver core instead of SMT core

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

src/model/model_implicant.cpp

@@ -897,7 +897,7 @@ expr_ref model_implicant::eval(model_ref& model, expr* e) {
                 args.resize(1);
                 args[0] = result;
                 args.append(stores[i]);
-                result = m_array.mk_store(args.size(), args.c_ptr());
+                result = m_array.mk_store(args);
             }
             return result;
         }