gh-123091: Use more _Py_IsImmortalLoose() (GH-123602)

Switch more _Py_IsImmortal(...) assertions to _Py_IsImmortalLoose(...)

The remaining calls to _Py_IsImmortal are in free-threaded-only code,
initialization of core objects, tests, and guards that fall back to
code that works with mortal objects.

Include/internal/pycore_object.h

@@ -314,7 +314,7 @@ static inline void
 _Py_INCREF_TYPE(PyTypeObject *type)
 {
     if (!_PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
-        assert(_Py_IsImmortal(type));
+        assert(_Py_IsImmortalLoose(type));
         return;
     }
 
@@ -354,7 +354,7 @@ static inline void
 _Py_DECREF_TYPE(PyTypeObject *type)
 {
     if (!_PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
-        assert(_Py_IsImmortal(type));
+        assert(_Py_IsImmortalLoose(type));
         return;
     }
 

Modules/_asynciomodule.c

@@ -1387,7 +1387,7 @@ FutureObj_get_state(FutureObj *fut, void *Py_UNUSED(ignored))
     default:
         assert (0);
     }
-    assert(_Py_IsImmortal(ret));
+    assert(_Py_IsImmortalLoose(ret));
     return ret;
 }
 

Objects/structseq.c

@@ -725,7 +725,7 @@ _PyStructSequence_FiniBuiltin(PyInterpreterState *interp, PyTypeObject *type)
     assert(type->tp_name != NULL);
     assert(type->tp_base == &PyTuple_Type);
     assert((type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN));
-    assert(_Py_IsImmortal(type));
+    assert(_Py_IsImmortalLoose(type));
 
     // Cannot delete a type if it still has subclasses
     if (_PyType_HasSubclasses(type)) {

Python/import.c

@@ -1049,7 +1049,7 @@ del_cached_def(struct extensions_cache_value *value)
        However, this decref would be problematic if the module def were
        dynamically allocated, it were the last ref, and this function
        were called with an interpreter other than the def's owner. */
-    assert(value->def == NULL || _Py_IsImmortal(value->def));
+    assert(value->def == NULL || _Py_IsImmortalLoose(value->def));
 
     Py_XDECREF(value->def->m_base.m_copy);
     value->def->m_base.m_copy = NULL;