CPython build failed with `--enable-pystats` after #118450

[Zheaoli]

Bug report

Bug description:

Python/specialize.c: In function ‘_Py_Specialize_ForIter’:
Python/specialize.c:2392:60: error: incompatible type for argument 1 of ‘_PySpecialization_ClassifyIterator’
 2392 |                         _PySpecialization_ClassifyIterator(iter));
      |                                                            ^~~~
      |                                                            |
      |                                                            _PyStackRef
Python/specialize.c:409:70: note: in definition of macro ‘SPECIALIZATION_FAIL’
  409 |         _Py_stats->opcode_stats[opcode].specialization.failure_kinds[kind]++; \
      |                                                                      ^~~~
Python/specialize.c:2290:47: note: expected ‘PyObject *’ {aka ‘struct _object *’} but argument is of type ‘_PyStackRef’
 2290 |  _PySpecialization_ClassifyIterator(PyObject *iter)
      |                                     ~~~~~~~~~~^~~~

Introduced after #118450

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-121082: Fix build failure when the developer use --enable-pystats arguments in configuration command after #118450 #121083

[Zheaoli]

cc @Fidget-Spinner