Replacing gcd_1 with gcd_11

[Niels Möller]

Do we have all needed gcd_11 so we can switch to using it, without
performance regressions?

Attached patch updates the small-number cases at the end of mpn_gcd.
This code would get simpler if we allowed one even input to gcd_11 and
gcd_22.

Regards,
/Niels

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