[pull] main from python:main#872
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…build (#145826) Add special cases for classmethod and staticmethod descriptors in _PyObject_GetMethodStackRef() to avoid calling tp_descr_get, which avoids reference count contention on the bound method and underlying callable. This improves scaling when calling classmethods and staticmethods from multiple threads. Also refactor method_vectorcall in classobject.c into a new _PyObject_VectorcallPrepend() helper so that it can be used by PyObject_VectorcallMethod as well.
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