gh-103879: Fix refleak in super specialization

[JelleZijlstra]

• Issue: Numerous refleaks on main #103879

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @JelleZijlstra for commit fb53869 🤖

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

[carljm]

Ugh, sorry about this and for wasting so much of your time tracking these down on your PEP 695 work yesterday!

I thought I'd run the refleak buildbots on the specialization PR, not sure what happened. I think maybe I triggered them but the buildbot fleet was backed up, and so they didn't actually start running for a long time, and then I later rebased the PR again assuming they had run and passed? Will be more careful checking that in future.

Your changes here look correct to me, since the res cached in the inline cache should be a borrowed reference (as noted in the comment), not a strong reference.

Approving, assuming the signal all looks green.

[JelleZijlstra]

I think there may be an issue where the default buildbot run doesn't include the refleak buildbots. If you look at the commits on github.com/python/cpython, the most recent ones are green, even though the buildbot website shows the refleak buildbots failing on main.

[JelleZijlstra]

Also, I now understand why my refleaks kept going away if I removed one too many lines: if the refleak is triggered on specialization, it only manifests if the code gets run enough times.