[3.10] bpo-42972: Fully implement GC protocol for re types (GH-26368)

[miss-islington]

(cherry picked from commit fba42d1)

Co-authored-by: Erlend Egeberg Aasland [email protected]

https://bugs.python.org/issue42972

[miss-islington]

@erlend-aasland and @vstinner: Status check is done, and it's a success ✅ .

[miss-islington]

@erlend-aasland and @vstinner: Status check is done, and it's a success ✅ .

[vstinner]

LGTM, good bot.

[vstinner]

On a single CI run, https://bugs.python.org/issue44252 occurred 3 times on 4 Windows jobs.

Tests / Windows (x86) (pull_request) Failing after 13m — Windows (x86)

=> 1 test failed: test_asyncio

Tests / Windows (x64) (pull_request) Failing after 13m — Windows (x64)

0:00:32 load avg: 6.46 [ 52/427/1] test_httplib crashed (Exit code 3221225477)
(...)
test_host_port (test.test_httplib.HTTPSTest) ... ok
Windows fatal exception: access violation

---

Azure Pipelines PR — #20210527.52 failed

64-bit:

test_host_port (test.test_httplib.HTTPSTest) ... ok
Windows fatal exception: access violation

32 bit:

test_host_port (test.test_httplib.HTTPSTest) ... ok
Windows fatal exception: access violation

[vstinner]

I re-run GHA jobs.