[issue45439] [C API] Move usage of tp_vectorcall_offset from public headers to the internal C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I should also check again the stack consumption. Old issues:

* bpo-29465: Modify _PyObject_FastCall() to reduce stack consumption
* bpo-29234: Disable inlining of _PyStack_AsTuple() to reduce the stack consumption
* bpo-29227: Reduce C stack consumption in function calls
* bpo-28858: Fastcall uses more C stack

See also: "Stack consumption" of https://vstinner.github.io/contrib-cpython-2017q1.html

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