[issue27581] Fix overflow check in PySequence_Tuple

[Roundup Robot]

Roundup Robot added the comment:

New changeset ad3762227655 by Martin Panter in branch '3.5':
Issue #27581: Don’t rely on overflow wrapping in PySequence_Tuple()
https://hg.python.org/cpython/rev/ad3762227655

New changeset 8f84942a0e40 by Martin Panter in branch 'default':
Issue #27581: Merge overflow fix from 3.5
https://hg.python.org/cpython/rev/8f84942a0e40

New changeset 55b6e51b878b by Martin Panter in branch '2.7':
Issue #27581: Don’t rely on overflow wrapping in PySequence_Tuple()
https://hg.python.org/cpython/rev/55b6e51b878b

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nosy: +python-dev

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