[MERGE REVIEW] Performance tweak for TreeTransform

[Aaron Bentley]

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John A Meinel wrote:
| Are you sure, the last revision I see there is:
|  1507 Aaron Bentley     2006-04-10
|       Fixed backup numbering to match GNU standard better

Well, it's there now.  Sorry.

| Well, I did some testing with revert, and it does indeed cut the time by
| as much as 1/2. (2.55s versus 1.38s).

Nice!

| So, after all, good enough to merge. Even better if you add a benchmark
| test.

I have added a benchmark and submitted it.

Aaron
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