[MERGE] Sha files for the stat cache more lazily rather than on first-examination, allowing less overall sha calculations to occur.

[Robert Collins]

This changes dirstates update_entry method to be a little less
aggressive about when to perform sha calls. Possibly it could be made to
never sha, but I haven't audited enough to say if thats a good idea or
not.

Anyhow, this change is quite modest, is safe for all callers I could
find, passes all tests, and results in no sha1 calculations for brand
new files in the tree, which was the primary case I was concerned about,
because that common case shows up heavily - it can easily cause cache
thrashing for people.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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