bug#12350: Composites identified as primes in factor.c (when HAVE_GMP)

[Torbjorn Granlund]

We found a bug causing performance problems for numbers between 2^64 and
2^127.  It could also trigger asserts with factoring numbers close to
2^127.

The new version is attached.

nt-factor-004.tar.lz
Description: Binary data

-- 
Torbjörn