[issue34970] Protect tasks weak set manipulation in asyncio.all_tasks()

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

>> we could consider risking cherry-picking it to 3.7.1 final.  Sound OK?
> Let's wait for Yuri opinion.

I agree it's a pretty serious bug; basically a time bomb that can crash a perfectly fine asyncio application.  The PR itself seems to be safe to cherry-pick to 3.7.1 even after rc2.  I suggest to merge it asap though to have some time for buildbots to test it.

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<https://bugs.python.org/issue34970>
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