[issue21922] PyLong: use GMP

[Mark Dickinson]

Mark Dickinson added the comment:

> When GMP encounters a memory allocation failure (exceeding the limits above or when running our of scratch space), it will just abort.

Ouch; that's not friendly.  Seems like this is part of the reason that Armin Rigo abandoned the attempt to use GMP in PyPy.  

https://bitbucket.org/pypy/pypy/issue/892/

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