cpython/Misc/NEWS.d/next/Core and Builtins/2019-07-10-09-56-47.bpo-37537.OkB0wd.rst

Compute allocated pymalloc blocks inside _Py_GetAllocatedBlocks().  This
slows down _Py_GetAllocatedBlocks() but gives a small speedup to
_PyObject_Malloc() and _PyObject_Free().