Some div_qr_2 assembler

[Niels Möller]

I've written a x86_64 loop for mpn_div_qr_2_pi1_norm, using 3/2
division. I had difficulty understanding the related assembler
implementation of divrem_2, so I wrote the new function from scratch.

Currently the new function is roughly one c/l slower than divrem_2 (36
c/l vs 35), but without any deep analysis, I hope it can be optimized to
gain one or a few cycles. It ought to be latency-limited.

/nisse

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