bpo-39542: Move object.h debug functions to internal C API

[vstinner]

Move the following functions from the public C API to the internal C
API:

• _PyDebug_PrintTotalRefs(),
• _Py_PrintReferenceAddresses()
• _Py_PrintReferences()

https://bugs.python.org/issue39542

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot PPC64LE Fedora 3.x has failed when building commit 4b52416.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/11/builds/290) and take a look at the build logs.
4. Check if the failure is related to this commit (4b52416) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/11/builds/290

Summary of the results of the build (if available):

Click to see traceback logs

remote: Enumerating objects: 9, done.�[K
remote: Counting objects:  11% (1/9)�[K
remote: Counting objects:  22% (2/9)�[K
remote: Counting objects:  33% (3/9)�[K
remote: Counting objects:  44% (4/9)�[K
remote: Counting objects:  55% (5/9)�[K
remote: Counting objects:  66% (6/9)�[K
remote: Counting objects:  77% (7/9)�[K
remote: Counting objects:  88% (8/9)�[K
remote: Counting objects: 100% (9/9)�[K
remote: Counting objects: 100% (9/9), done.�[K
remote: Total 9 (delta 8), reused 8 (delta 8), pack-reused 0�[K
From https://github.com/python/cpython
 * branch            master     -> FETCH_HEAD
Reset branch 'master'

Assembler messages:
Fatal error: can't create Objects/funcobject.o: No space left on device
make: *** [Objects/funcobject.o] Error 1

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make: [clean-retain-profile] Error 1 (ignored)