[MERGE] Make bzr log FILE faster by looking up text_keys one at a time.

[John Arbash Meinel]

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Gary van der Merwe wrote:
| Hi
|
| I stumbled on the fact that by looking up text indexes one at a time
| is much faster than looking up a bunch of them. By doing this, we can
| make bzr log FILE faster.
|
| Tests with --ls-prof showed a 44% improvement for "bzr log
| bzrlib\tree.py >dev/nul"
|
| Gary
|

BB:comment

Do you want us to mark this as Resubmit for now? Have you gotten any
farther on it?

John
=:->

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