Removal of "--merge-order"?

I just tested it again, and

	git-rev-list --merge-order HEAD

takes an inordinate amount of time:

	real    5m1.139s
	user    4m59.504s
	sys     0m1.220s

and that's on a reasonably fast machine (not my fastest, but no slouch by any measure - my fastest machine I'm not allowed to really benchmark publicly ;)

It may be a cool algorithm, but it's essentially useless on any bigger tree. And nobody uses it, since "--topo-order" gives the guarantees that people really care about, and finishes in 0.537 seconds on the same machine with the same tree.

It also depends on the openssh "bignum" stuff, which means that any machine where we just rely on our own SHA1 implementation and don't use openssh doesn't have the flag anyway.

In other words, I'd really prefer if it was gone. Some of the things I might do to git-rev-list would be much simpler if I didn't have to worry about merge-order, and the way it interfaces with the rest of git-rev-list.

Comments?

			Linus