py: Add LOAD_NULL bytecode and use it to simplify function calls.
Adding this bytecode allows to remove 4 others related to
function/method calls with * and ** support. Will also help with
bytecodes that make functions/closures with default positional and
keyword args.
diff --git a/py/runtime.h b/py/runtime.h
index f79cb2e..d71e045 100644
--- a/py/runtime.h
+++ b/py/runtime.h
@@ -43,7 +43,7 @@
mp_obj_t mp_call_function_n_kw_for_native(mp_obj_t fun_in, uint n_args_kw, const mp_obj_t *args);
mp_obj_t mp_call_function_n_kw(mp_obj_t fun, uint n_args, uint n_kw, const mp_obj_t *args);
mp_obj_t mp_call_method_n_kw(uint n_args, uint n_kw, const mp_obj_t *args);
-mp_obj_t mp_call_method_n_kw_var(bool have_self, uint n_args_n_kw, const mp_obj_t *args, mp_obj_t pos_seq, mp_obj_t kw_dict);
+mp_obj_t mp_call_method_n_kw_var(bool have_self, uint n_args_n_kw, const mp_obj_t *args);
mp_obj_t mp_build_tuple(int n_args, mp_obj_t *items);
mp_obj_t mp_build_list(int n_args, mp_obj_t *items);