[MERGE] Minor tree and dirstate code cleanups

[Ian Clatworthy]

Robert Collins wrote:

>> I'm happy to back that bit out btw - just explaining why I changed it.
> 
> if <string>: is 6 times faster than if len(string) > 0.
> 
> When the failure mode is safe, 'if thing' is very efficient.

OK. Backed out.

Changed N -> 3 as well as discussed.

Ian C.
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