[issue28839] _PyFunction_FastCallDict(): replace PyTuple_New() with PyMem_Malloc()

[STINNER Victor]

STINNER Victor added the comment:

Serhiy: "small_stack increases C stack consumption even for calls without keyword arguments. This is serious problem since we can't control stack overflow."

This problem is not new and is worked around by Py_EnterRecursiveCall() macro which counts the depth of the Python stack.

I didn't notice any stack overflow crash with my patch. We can reduce the "small_stack" size later if needed.

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