performance heads up...path2id

[Aaron Bentley]

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Robert Collins wrote:
| Quite a bit of code uses 'path2id' routinely. This is a heads up - our
| current datastructure makes that call relatively expensive - we split
| the path and then walk the tree. Where possible, if you are doing loops
| over trees or the like, try to use id's more often, or get and hold the
| inventory entry of the file you are manipulating rather than looking it
| up afresh each time.

Yes, I knew that, but I was trying to avoid premature optimization.  I
guess we've gotten to the point that it's not premature anymore.

Aaron
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