Small operands gcd improvements

[Torbjörn Granlund]

nisse at lysator.liu.se (Niels Möller) writes:

  BTW, below is one (untested) way to organize gcd_22. Wants an sub_mddmmss,
  with output carry as a mask, analogous to the add_mssaaaa defined in
  mod_1_1.c.

I fixed a variable misspelling and defined the needed macro.  I also
modified the return type's declaration.  The code fails in most cases,
but occasionally gets things right.

I'll leave it to you to debug it further.

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Torbjörn
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