[MERGE] make sha1_provider a parameter to DirState()

[John Arbash Meinel]

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Ian Clatworthy wrote:
> Martin Pool wrote:

...
> Done. This was definitely worth doing as it exposed some other entry
> points (initialize(), from_tree()) that needed to support a sha1_provider
> parameter.
> 
> New patch attached. The tweaks were large enough that I'm resubmitting
> this rather than just land it.
> 
> Ian C.
> 


BB:comment

This certainly has my approval, but as I did some of the work on it,
someone else could officially vote if we prefer.

John
=:->
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