gh-139103: Improve namedtuple scaling in free-threaded build #144332
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Add `_Py_type_getattro_stackref`, a variant of type attribute lookup that returns `_PyStackRef` instead of `PyObject*`. This allows returning deferred references in the free-threaded build, reducing reference count contention when accessing type attributes. This significantly improves scaling of namedtuple instantiation across multiple threads.
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Add
_Py_type_getattro_stackref, a variant of type attribute lookup that returns_PyStackRefinstead ofPyObject*. This allows returning deferred references in the free-threaded build, reducing reference count contention when accessing type attributes.This improves scaling of namedtuple instantiation across multiple threads.