[subinterpreters] Replace static string caches with subinterpreter-compatible alternatives

[Fidget-Spinner]

BPO	44156
Nosy	@vstinner, @ericsnowcurrently, @Fidget-Spinner
PRs	bpo-44156: Make cached string constants in compile.c subinterpreter compatible #26161

^{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 2021-10-20.16:03:49.237>
created_at = <Date 2021-05-17.09:34:25.240>
labels = ['expert-subinterpreters', '3.11']
title = '[subinterpreters] Replace static string caches with subinterpreter-compatible alternatives'
updated_at = <Date 2021-10-20.16:03:49.236>
user = 'https://github.com/Fidget-Spinner'

bugs.python.org fields:

activity = <Date 2021-10-20.16:03:49.236>
actor = 'kj'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.16:03:49.237>
closer = 'kj'
components = ['Subinterpreters']
creation = <Date 2021-05-17.09:34:25.240>
creator = 'kj'
dependencies = []
files = []
hgrepos = []
issue_num = 44156
keywords = ['patch']
message_count = 3.0
messages = ['393800', '394352', '404483']
nosy_count = 3.0
nosy_names = ['vstinner', 'eric.snow', 'kj']
pr_nums = ['26161']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue44156'
versions = ['Python 3.11']

[Fidget-Spinner]

Hello, this is a meta issue for replacing cached string constants in various places with alternatives compatible with subinterpreters such as _Py_IDENTIFIER.

Ideally the replacements should not cause any performance regression. But to be safe I would recommend starting in places that aren't "hot".

A list of such caches can be found via a tool created by Eric: https://www.github.com/python/cpython/tree/main/Tools%2Fc-analyzer.

Thanks everyone!

[vstinner]

New changeset 2966924 by Ken Jin in branch 'main':
bpo-44156: Make cached string constants in compile.c subinterpreter compatible (GH-26161)
2966924

[Fidget-Spinner]

I'll open separate issues for other similar changes.