[issue35053] Enhance tracemalloc to trace properly free lists

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

This change modifies _Py_NewReference() which is a very important function and it impacts Python performance. I prefer to keep the bug in Python 3.6 and 3.7 to not risk to introduce a regression.

The bug exists since Python 3.4 and I'm the first one to spot it. It's not like there is huge pressure to backport the fix.

Thanks again INADA-san for the review!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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<https://bugs.python.org/issue35053>
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