[MERGE] Stop passing specific_file lists to show_tree_status

[John Arbash Meinel]

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Robert Collins wrote:
> This fixes a performance regression in 'bzr status .' and similar
> invocations.
> 
> specific path processing is much more expensive than full-tree
> processing, when the same set of paths is being considered, so we should
> not pass in specific_files except when there are actually interesting
> files :)
> 
> -Rob
> 

BB:approve

John
=:->

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