Small operands gcd improvements

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

>   I hope we don't we have to do that all at once, but can the mpn_gcd_11
>   entry point be optional (via HAVE_NATIVE_*)?
>
> Yes, otherwise it'll never happen!

It's not obvious to me how to organize that. Can we do it like this?

* gcd_11.c and gcd_1.c as separate source files.

* There's no reason to override gcd_1 in assembly without also
  overriding gcd_11. To do that one can have either separate gcd_11.asm
  and gcd_1.asm, or have a single gcd_1.asm with both entrypoints. To
  support the latter case, gcd_11.c (which is still built)
  must put its implementation inside #if !HAVE_NATIVE_gcd_11.

Does that work? Is there any simpler way? One could require separate asm
files, but then existing files need to be split when gcd_11 is added.

Longer term, maybe there's no need to have assembly gcd_1 at all.

Regards,
/Niels
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