[MERGE][1.0] Fixes for find_differences() and get_parents_map()

[Aaron Bentley]

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John Arbash Meinel wrote:
> Aaron Bentley wrote:
>> "Re: [MERGE][1.0] Graph.heads() optimization... Now 1770x"
>>  * contains Graph._preload_parents, but later merge requests retract it
> 
> Hm... I thought I send the patches correctly. _preload_parents is only
> get_parents_map wrapped around get_parents. (Turn the list into a dictionary.)
> So there is no reason to have it if we have get_parents_map.
> 
> There *was* a ParentsProvider.preload_parents() function which I completely
> removed. So whether on not a private helper function exists doesn't seem like
> it should block a review.

Sorry, I misunderstood.

Aaron
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