Latest commit introduces undefined behavior in hgcd2.c

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

> Or simply:
>
>   dh = (dh << dcnt) + (dl >> (GMP_LIMB_BITS - 1 - dcnt) >> 1);

Looks better, thanks.

Regards,
/Niels

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