bpo-46753: Add the empty tuple to the _PyRuntimeState.global_objects.

[ericsnowcurrently]

https://bugs.python.org/issue46753

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ericsnowcurrently for commit efed1d1 🤖

If you want to schedule another build, you need to add the "🔨 test-with-buildbots" label again.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ericsnowcurrently for commit 597f1bd 🤖

If you want to schedule another build, you need to add the "🔨 test-with-buildbots" label again.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ericsnowcurrently for commit fdc82d2 🤖

If you want to schedule another build, you need to add the "🔨 test-with-buildbots" label again.

[ericsnowcurrently]

Note that c163aca is the actual global empty tuple part. Everything else is cleanup (in particularly to make sure I got the freelist stuff right).