[MERGE] Accelerate no-op pull

[Aaron Bentley]

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Robert Collins wrote:
>> - - It delays history retrieval until it has been shown to be needed

> get_graph() shouldn't be doing any intrinsic history retrieval, so I'm
> not sure how it delays history retrival.

Not get_graph; cmd_pull.run invoked Branch.revision_history; now it does
Repository.iter_reverse_revision_history, but only if last_revision has
changed.

> However, do all tests still pass?

Yes.

> It looks to me like this will no
> longer error on a missing revision in the source (which is part of the
> current contract) and why the current code didn't just check all
> requested items were in the target. If all tests pass:

Okie dokie.

Aaron



> 
> -Rob

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