add optimizer op

Author: noamcohen97

Python/optimizer_bytecodes.c

@@ -914,6 +914,13 @@ dummy_func(void) {
         }
     }
 
+    op(_ITER_CHECK_TUPLE, (iter, null_or_index -- iter, null_or_index)) {
+        if (sym_matches_type(iter, &PyTuple_Type)) {
+            REPLACE_OP(this_instr, _NOP, 0, 0);
+        }
+        sym_set_type(iter, &PyTuple_Type);
+    }
+
     op(_ITER_NEXT_RANGE, (iter, null_or_index -- iter, null_or_index, next)) {
        next = sym_new_type(ctx, &PyLong_Type);
     }