What should we do with this?

It seems that #12362, which was supposed to make RandomGNP() faster,
actually slows down RandomGNP() a lot in some cases.

In sage-5.0.beta7:
sage: timeit('graphs.RandomGNP(2000, .01)')
5 loops, best of 3: 263 ms per loop

In sage-5.0.beta9:
sage: timeit('graphs.RandomGNP(2000, .01)')
5 loops, best of 3: 3.73 s per loop

This is a slowdown of a factor more than 10.

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