[MERGE] log performance

[Aaron Bentley]

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Hi all,

This patch optimizes performance of log formatters that don't show
merges (i.e. --short and --line).

1. It adds a new codepath for selecting the revisions to display
2. It does not retrieve revisions that will not be displayed

In my tests (which have a 1:1 ratio of merges to mainline), it goes from
190 ms to 109ms, that is 1.74x as fast.

Aaron
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