[MERGE] more common-ancestor performance improvements.

[Aaron Bentley]

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Aaron Bentley wrote:
> Aaron Bentley wrote:
>> Robert Collins wrote:
>>> This sounds great.
> 
> Robert and I have had some private discussion about restructuring the
> API.  Here's my attempt to implement that as much as I understand it.

Could I get a review on this please?  I do not like to violate our
practice of getting two +1s before submission, but Martin's "don't let
us block you" does trump it, and I've been waiting on a review since May 27.

Aaron
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