[LLVMdev] git Status

[FlyLanguage]

> I'd also recommand "git pull --rebase" if the goal is to keep history
> linear. Note that this has to go with a big, fat, warning, telling the
> user that rebasing published history is bad. Rebase is a very good tool
> to work with private history, but as soon as you've pushed it to some
> place visible by other people, you should stop using it.

This is enormously important - once submodule maintainers starts 
rebasing, we're screwed.