[MERGE] iter-changes based commit

[Ian Clatworthy]

The attached patch speeds up a commit of 6 new files by 15% on a Mozilla
tree: 30.4 secs to 25.9 secs. It should become redundant in the next
release or so when Robert's better iterator lands. But that code isn't
ready and this code is.

Is it worth the benefit/risk of including this in 0.91?

Ian C.
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