[issue31356] Add context manager to temporarily disable GC

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Note that threads can break this. Even without calling gc.enable() explicitly, "with gc_disabled()" in different thread can enable GC inside other "with gc_disabled()" block.

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nosy: +pitrou, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31356>
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