[3.4] bpo-26617: Ensure gc tracking is off when invoking weakref callbacks.#2695

larryhastings merged 2 commits intopython:3.4python/cpython:3.4from

serhiy-storchaka:backport-8f657c3-3.4serhiy-storchaka/cpython:backport-8f657c3-3.4Copy head branch name to clipboard