Import upstream Github python/cpython ref 'main'

Summary:
Imported python/cpython `3.15.0a5+` from upstream rev [`a2495ff`](https://www.github.com/python/cpython/commit/a2495ff1e7b370c26128aa41298edb9ff06b5666) (committed 2026-02-07 03:11:58+00:00).

# Commit Info

Base: (`3.15.0a5+`) - [`957f9fe`](https://www.github.com/python/cpython/commit/957f9fe162398fceeaa9ddba8b40046b8a03176d) (commit date: 2026-02-05 20:37:05+00:00)
Imported: (`3.15.0a5+`) - [`a2495ff`](https://www.github.com/python/cpython/commit/a2495ff1e7b370c26128aa41298edb9ff06b5666) (commit date: 2026-02-07 03:11:58+00:00)

# Files added

```
Lib/test/test_free_threading/test_frame.py
Misc/NEWS.d/next/Core_and_Builtins/2026-01-29-16-57-11.gh-issue-139103.icXIEQ.rst
Misc/NEWS.d/next/Core_and_Builtins/2026-02-03-17-08-13.gh-issue-144446.db5619.rst
Misc/NEWS.d/next/Core_and_Builtins/2026-02-05-13-30-00.gh-issue-144513.IjSTd7.rst
Misc/NEWS.d/next/Core_and_Builtins/2026-02-06-17-59-47.gh-issue-144549.5BhPlY.rst
Misc/NEWS.d/next/Library/2025-12-28-15-55-53.gh-issue-101178.26jYPs.rst
Misc/NEWS.d/next/Library/2026-01-20-20-54-46.gh-issue-143658.v8i1jE.rst
Misc/NEWS.d/next/Library/2026-02-05-17-15-31.gh-issue-144493.XuxwVu.rst
```

Differential Revision: D92599508

fbshipit-source-id: b703f05bc3e6e80f59fb752e2ffa0971162d4de7

Author: generatedunixname1734921407115435

cinderx/Interpreter/3.15/Includes/generated_cases.c.h

@@ -9378,44 +9378,27 @@
                 self_or_null = &stack_pointer[0];
                 PyObject *name = GETITEM(FRAME_CO_NAMES, oparg >> 1);
                 if (oparg & 1) {
-                    _PyCStackRef method;
                     _PyFrame_SetStackPointer(frame, stack_pointer);
-                    _PyThreadState_PushCStackRef(tstate, &method);
-                    int is_meth = _PyObject_GetMethodStackRef(tstate, PyStackRef_AsPyObjectBorrow(owner), name, &method.ref);
+                    attr = _Py_LoadAttr_StackRefSteal(tstate, owner, name, self_or_null);
                     stack_pointer = _PyFrame_GetStackPointer(frame);
-                    if (is_meth) {
-                        assert(!PyStackRef_IsNull(method.ref));
-                        self_or_null[0] = owner;
-                        attr = _PyThreadState_PopCStackRefSteal(tstate, &method);
-                    }
-                    else {
-                        stack_pointer += -1;
-                        ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
-                        _PyFrame_SetStackPointer(frame, stack_pointer);
-                        PyStackRef_CLOSE(owner);
-                        stack_pointer = _PyFrame_GetStackPointer(frame);
-                        self_or_null[0] = PyStackRef_NULL;
-                        attr = _PyThreadState_PopCStackRefSteal(tstate, &method);
-                        if (PyStackRef_IsNull(attr)) {
-                            JUMP_TO_LABEL(error);
-                        }
-                        stack_pointer += 1;
+                    if (PyStackRef_IsNull(attr)) {
+                        JUMP_TO_LABEL(pop_1_error);
                     }
                 }
                 else {
                     _PyFrame_SetStackPointer(frame, stack_pointer);
-                    PyObject *attr_o = PyObject_GetAttr(PyStackRef_AsPyObjectBorrow(owner), name);
+                    attr = _PyObject_GetAttrStackRef(PyStackRef_AsPyObjectBorrow(owner), name);
                     stack_pointer = _PyFrame_GetStackPointer(frame);
-                    stack_pointer += -1;
+                    stack_pointer[-1] = attr;
+                    stack_pointer += (oparg&1);
                     ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
                     _PyFrame_SetStackPointer(frame, stack_pointer);
                     PyStackRef_CLOSE(owner);
                     stack_pointer = _PyFrame_GetStackPointer(frame);
-                    if (attr_o == NULL) {
+                    if (PyStackRef_IsNull(attr)) {
                         JUMP_TO_LABEL(error);
                     }
-                    attr = PyStackRef_FromPyObjectSteal(attr_o);
-                    stack_pointer += 1;
+                    stack_pointer += -(oparg&1);
                 }
             }
             stack_pointer[-1] = attr;

cinderx/UpstreamBorrow/borrowed-3.15.gen_cached.c

@@ -2645,7 +2645,7 @@ take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame)
     _PyFrame_Copy(frame, new_frame);
     // _PyFrame_Copy takes the reference to the executable,
     // so we need to restore it.
-    frame->f_executable = PyStackRef_DUP(new_frame->f_executable);
+    new_frame->f_executable = PyStackRef_DUP(new_frame->f_executable);
     f->f_frame = new_frame;
     new_frame->owner = FRAME_OWNED_BY_FRAME_OBJECT;
     if (_PyFrame_IsIncomplete(new_frame)) {