[PATCH] Add commit message guidelines to developer policy

[Richard Smith]

The attribution requirement, complete with exclamation mark, is already our policy: http://llvm.org/docs/DeveloperPolicy.html#attribution-of-changes

I've heard of people grepping through commit logs looking for such commits based on this, so there are non-obvious costs to changing it.


http://reviews.llvm.org/D8197

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