[issue1621] Do not assume signed integer overflow behavior

[Ismail Donmez]

Ismail Donmez added the comment:

Possibly last one before final patch, only Modules/_sre.c left to fix, I
appreciate help on that. Please ignore tab problems, I think that can be
fixed later on.

Thanks.

Added file: http://bugs.python.org/file9239/fix-overflows-try3.patch

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