Remove undocumented and deprecated sys.callstats() function

[vstinner]

BPO	37414
Nosy	@vstinner
PRs	bpo-37414: Remove sys.callstats() #14398

^{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 2019-06-26.16:01:23.419>
created_at = <Date 2019-06-26.15:26:46.971>
labels = ['interpreter-core', '3.9']
title = 'Remove undocumented and deprecated sys.callstats() function'
updated_at = <Date 2019-06-26.16:01:23.419>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-06-26.16:01:23.419>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-06-26.16:01:23.419>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2019-06-26.15:26:46.971>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 37414
keywords = ['patch']
message_count = 2.0
messages = ['346634', '346644']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['14398']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37414'
versions = ['Python 3.9']

[vstinner]

In Python 3.6, sys.callstats() was a way to retrieve statistics produced by Python/ceval.c when Python was compiled with a special build option: CALL_PROFILE. The function was implemented with PyEval_GetCallStats().

I removed CALL_PROFILE special build and deprecated sys.callstats() in bpo-28799:

commit a61a54b
Author: Victor Stinner <victor.stinner@gmail.com>
Date: Mon Nov 28 12:06:13 2016 +0100

Issue bpo-28799: Update [Misc/SpecialBuilds.txt](https://github.com/python/cpython/blob/main/Misc/SpecialBuilds.txt)

Remove CALL_PROFILE.

sys.callstats() always returned None since Python 3.7.

Attached PR removed sys.callstats().

[vstinner]

New changeset 6915066 by Victor Stinner in branch 'master':
bpo-37414: Remove sys.callstats() (GH-14398)
6915066