[issue28870] Reduce stack consumption of PyObject_CallFunctionObjArgs() and like

[STINNER Victor]

STINNER Victor added the comment:

Python 3.4 (rev 6340c9fcc111):

test_python_call: 9700 calls before crash, stack: 864 bytes/call
test_python_getitem: 8314 calls before crash, stack: 1008 bytes/call
test_python_iterator: 7818 calls before crash, stack: 1072 bytes/call

=> total: 25832 calls, 2944 bytes

Python 2.7 (rev 0d4e0a736688):

test_python_call: 6162 calls before crash, stack: 1360 bytes/call
test_python_getitem: 5952 calls before crash, stack: 1408 bytes/call
test_python_iterator: 5885 calls before crash, stack: 1424 bytes/call

=> total: 17999 calls, 4192 bytes

Nice. At least, Python 3.7 is better than Python 2.7 (4080 bytes <
4192 bytes) :-) Python 3.4 stack usage was very low, and lower than
Python 3.5.

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