72-bit version of LPM_DIVIDE

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Have lots of redundant pipeline stage registers before the divide and turn register retiming on.

From a discussion in another thread, it appears it will work, but not be as efficient as the megafunction.

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my tests indicated that only 1 set of registers gets moved to the internal logic with register retiming. in that case it would be good to have 2 sets of input registers, and 1 set of output registers. 3 sets did not improve fmax.