Small operands gcd improvements

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

> nisse at lysator.liu.se (Niels Möller) writes:
>
>   So I see no strong reason to do it one way or the other. Maybe start
>   with requiring both u and v odd, and relax requirements later in case we
>   find any more tangible benefit from doing that?
>
> Makes sense.

Here's a patch to take out gcd_11 to it's own C file, and call it from
gcd_1.c. Needs documentation (if you agree it should be a public
function), and it would be nice with separate tests for this function.

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Seems to pass existing tests/mpz/t_gcd_ui.

Regards,
/Niels

PS. It seems I tried something similar back in 2014, but that was before
the cleanup where we deleted unused gcd_1 code variants and tricky
gotos.

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