mini-gmp: mpz_abs_sub_bit needs more normalization

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

> Will you please take a look to see if this is done in more places?  Then
> fix for the 6.0 repo as well as the head repo (and perhaps 5.1 repo if
> the bug is there).

I'll try to get to it.

> I thought mini-gmp now had complete testing after my rants about it...

It has pretty good coverage, but that doesn't mean that *all* corner cases
are covered...

At least it triggered an assert on the next operation depending on mpz
values being properly normalized.

Regards,
/Niels

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