Use Py_ssize_t in _PyEval_EvalCodeWithName()

Use Py_ssize_t in _PyEval_EvalCodeWithName()

Issue #27128, #18295: replace int type with Py_ssize_t for index variables used
for positional arguments. It should help to avoid integer overflow and help to
emit better machine code for "i++" (no trap needed for overflow).

Make also the total_args variable constant.