Some div_qr_2 assembler

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> So removing the handling of that, without understanding every detail of
> the code, seems like better use of time than start from scratch,

Well, problem was that it wasn't even clear to me if divrem_2 used the
current 3/2 method or some different strategy. With a working 3/2
implementation which I understand to compare with, it will be easier to
figure things out, and then I can copy the inner loop.

/nisse

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