[issue38644] Pass explicitly tstate to function calls

[STINNER Victor]

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

> One further step would be to change the VECTORCALL/FASTCALL calling convention to pass tstate.

My first strong motivation is to get None singleton from tstate. It's now being discussed in bpo-39511: "[subinterpreters] Per-interpreter singletons (None, True, False, etc.)".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38644>
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