mpn_mul_fft type overflow issue

[Torbjorn Granlund]

Mark Sofroniou <marks at wolfram.com> writes:

  Attached is a revised patch for mul_fft.
  
Starting with your patch, I came up with the following.
I believe it changes the typing more adequately.

I am not able to test this for huge operands.

Please give it a spin, and please read it to see that I didn't mess
something up.

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