replace PyTuple_SetItem() with PyTuple_SET_ITEM() in long_divmod()

[sir-sigurd]

BPO	36063
Nosy	@serhiy-storchaka, @sir-sigurd
PRs	bpo-36063: Minor performance tweak in long_divmod() #11915

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-02-21.10:01:57.448>
created_at = <Date 2019-02-21.09:41:35.771>
labels = ['3.8', 'performance']
title = 'replace PyTuple_SetItem() with PyTuple_SET_ITEM() in long_divmod()'
updated_at = <Date 2019-02-21.10:01:57.447>
user = 'https://github.com/sir-sigurd'

bugs.python.org fields:

activity = <Date 2019-02-21.10:01:57.447>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-21.10:01:57.448>
closer = 'serhiy.storchaka'
components = []
creation = <Date 2019-02-21.09:41:35.771>
creator = 'sir-sigurd'
dependencies = []
files = []
hgrepos = []
issue_num = 36063
keywords = ['patch']
message_count = 2.0
messages = ['336194', '336196']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'sir-sigurd']
pr_nums = ['11915']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue36063'
versions = ['Python 3.8']

[sir-sigurd]

This change produces minor speed-up:

$ python-other -m perf timeit -s "divmod_ = divmod" "divmod_(1, 1)" --duplicate=1000 --compare-to=../cpython-master/venv/bin/python
python: ..................... 64.6 ns +- 4.8 ns
python-other: ..................... 59.4 ns +- 3.2 ns

Mean +- std dev: [python] 64.6 ns +- 4.8 ns -> [python-other] 59.4 ns +- 3.2 ns: 1.09x faster (-8%)

[serhiy-storchaka]

New changeset ea6207d by Serhiy Storchaka (Sergey Fedoseev) in branch 'master':
bpo-36063: Minor performance tweak in long_divmod(). (GH-11915)
ea6207d