[MERGE] Turn record_iter_changes into a generator to emit file system hashes.

[John Arbash Meinel]

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Robert Collins wrote:
> This makes record_iter_changes yield the results of sha1 calculations it
> does so that they can be cached.
> 
> -Rob
> 

BB:tweak

Since BB seems down right now, but according to the tweaks in my other
email.

John
=:->

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