gh-117657: Don't specialize RESUME_CHECK when specialization is disabled

[Fidget-Spinner]

It was showing up as a race in tsan. Though other races still bubble up with vectorcall so we cant remove it from the ignore list for now.

• Issue: Make TSAN tests pass with the GIL disabled in free-threaded builds #117657

[swtaarrs]

Code looks good to me, but it might make sense to change the title to something like "Don't specialize RESUME_CHECK when specialization is disabled", which is what this is really doing. It's a good fix independent of free-threading concerns.

[Fidget-Spinner]

@DinoV made this atomic but we should still disable this if specialization is off anyways, for consistency's sake.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.x has failed when building commit 7fabcc7.

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/1380/builds/134) and take a look at the build logs.
4. Check if the failure is related to this commit (7fabcc7) 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/1380/builds/134

Failed tests:

• test_posix

Failed subtests:

• test_confstr - test.test_posix.PosixTester.test_confstr

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Users/buildbot/Library/Developer/XCTestDevices/AEE8DE28-E153-4624-933C-E9440AD6F955/data/Containers/Bundle/Application/02D17676-135F-425E-BBA6-933A29FA2609/iOSTestbed.app/python/lib/python3.13/test/test_posix.py", line 569, in test_confstr
    self.assertEqual(len(posix.confstr("CS_PATH")) > 0, True)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: False != True