GMP 6.1.2 t-count_zeros failure on ARM with assertions

[Marc Glisse]

On Wed, 27 Dec 2017, Niels Möller wrote:

> nisse at lysator.liu.se (Niels Möller) writes:
>
>> Pushed now.
>
> And below, a patch to delete all mention of COUNT_LEADING_ZEROS_0,
> except for tune/many.pl, which I'm not familiar with. What do you think?

It seems a bit sad to drop this information, in case we want to use it in 
the future, or if we want to share the file longlong.h with other 
projects.

As far as I understand, the issue was an inconsistency between using gcc's 
__builtin_clz (instead of some intrinsic or inline asm for the CLZ 
instruction) and still defining the macro COUNT_LEADING_ZEROS_0 to 32. I 
am not sure that warrants removing all COUNT_LEADING_ZEROS_0 everywhere.

But if we aren't using it at all, I don't have a very strong opinion.

-- 
Marc Glisse