py/vm: Use enum names instead of magic numbers in multi-opcode dispatch.

py/vm.c

@@ -1270,10 +1270,10 @@ yield:
                     } else if (ip[-1] < MP_BC_STORE_FAST_MULTI + 16) {
                         fastn[MP_BC_STORE_FAST_MULTI - (mp_int_t)ip[-1]] = POP();
                         DISPATCH();
-                    } else if (ip[-1] < MP_BC_UNARY_OP_MULTI + 7) {
+                    } else if (ip[-1] < MP_BC_UNARY_OP_MULTI + MP_UNARY_OP_NUM_BYTECODE) {
                         SET_TOP(mp_unary_op(ip[-1] - MP_BC_UNARY_OP_MULTI, TOP()));
                         DISPATCH();
-                    } else if (ip[-1] < MP_BC_BINARY_OP_MULTI + 36) {
+                    } else if (ip[-1] < MP_BC_BINARY_OP_MULTI + MP_BINARY_OP_NUM_BYTECODE) {
                         mp_obj_t rhs = POP();
                         mp_obj_t lhs = TOP();
                         SET_TOP(mp_binary_op(ip[-1] - MP_BC_BINARY_OP_MULTI, lhs, rhs));