[RFC]combine find_ids_across_trees and tree._iter_changes

[Robert Collins]

Aaron, for dirstate, we can do single-pass diff generation straight from
file paths - correctly - without needing a call to
find_ids_across_trees: I've got a dirstate tuned version of that call,
but rather than change the api to return paths and ids, I'd like to just
avoid invoking it at all - in the common case it just gathers all the
ids from all trees, which isn't very helpful at all as we end up
considering all ids anyway.

Is this ok with you ? If not do you have a proposed alternative ?

-Rob
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