[MERGE] Speed up diff spec handling.

[Aaron Bentley]

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Stefan Monnier wrote:
>> This patch speeds up diff's handling of revision specs by using the new
>> as_revision_id method.
> 
> Cool.  `bzr diff -r ancestor:../trunk lisp/minibuffer.el' is reduced
> from more than a minute to less than 2s.

Cool.  I'm glad that's improved.

Aaron
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