gcd_22

[Niels Möller]

Attached is a patch to move the current (slow) gcd_2 to a separate file, rename
it mpn_gcd_22, change argument and return type, and add a basic test.

Do you agree with the naming in 

typedef struct
{
  mp_limb_t d0, d1;
} mp_double_limb_t;

or should it be something else?

Next would be speed support, and then it's easier to try ways to make it
faster.

Regards,
/Niels

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