Statically allocate and initialize the latin1 characters.

[kumaraditya303]

BPO	46881
Nosy	@gvanrossum, @markshannon, @ericsnowcurrently, @JelleZijlstra, @miss-islington, @Fidget-Spinner, @kumaraditya303
PRs	bpo-46881: Statically allocate and initialize the latin1 characters. #31616 bpo-46881: Fix refleak from GH-31616 #31805

^{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 2022-03-10.06:26:24.643>
created_at = <Date 2022-02-28.13:02:28.503>
labels = ['interpreter-core', '3.11', 'performance']
title = 'Statically allocate and initialize the latin1 characters.'
updated_at = <Date 2022-03-11.09:05:16.593>
user = 'https://github.com/kumaraditya303'

bugs.python.org fields:

activity = <Date 2022-03-11.09:05:16.593>
actor = 'kj'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-10.06:26:24.643>
closer = 'kumaraditya'
components = ['Interpreter Core']
creation = <Date 2022-02-28.13:02:28.503>
creator = 'kumaraditya'
dependencies = []
files = []
hgrepos = []
issue_num = 46881
keywords = ['patch']
message_count = 3.0
messages = ['414195', '414819', '414896']
nosy_count = 7.0
nosy_names = ['gvanrossum', 'Mark.Shannon', 'eric.snow', 'JelleZijlstra', 'miss-islington', 'kj', 'kumaraditya']
pr_nums = ['31616', '31805']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue46881'
versions = ['Python 3.11']

[kumaraditya303]

Statically allocate and initialize the latin1 characters. This *should* make iterating over a ascii strings faster as it avoids an atomic read in PyInterpreterState_GET() to get unicode state in get_latin1_char, makes get_latin1_char branchless and can be used in deepfreeze for identifiers.

[miss-islington]

New changeset 8714b6f by Kumar Aditya in branch 'main':
bpo-46881: Statically allocate and initialize the latin1 characters. (GH-31616)
8714b6f

[Fidget-Spinner]

New changeset 54ab9ad by Jelle Zijlstra in branch 'main':
bpo-46881: Fix refleak from #75797 (GH-31805)
54ab9ad