Add post-rewrite hook about glock HOT 3 CLOSED

Thanks for pointing that out, as long as it's easy to get the log of changes between the two commits it should be easy to the post-rewrite hook... pull requests accepted of course :)

I think syncing on every checkout would be a little bit overkill though - changing dependency versions between branches happens pretty infrequently, at least in my normal work.

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We're testing a post-rewrite hook here: https://github.com/cockroachdb/cockroach/blob/172d47bbc808af1f986bb7cd257b2c310dd2ef63/githooks/post-rewrite. I'll send a PR once we've had a little more experience with it.

Changing versions between branches doesn't happen frequently, but it does happen and when it does it often breaks the build unless you manually sync. An extra git log call per checkout seems like a small price to pay to me.

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Cool!

Oh, I understood your suggestion to be to blindly glock sync on every checkout. If it's only when there was actually a change to the GLOCKFILE like the other operations, I agree

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