Heads-up: Clang's Options.td is being refactored and risks conflicts for downstream clients

This is just a heads up if you see a large amount of conflicts in Options.td in your downstream fork of clang. ⚙ D157150 [Driver] Update BoolOption to handle Visibility. NFC and ⚙ D157151 [Driver] Refactor to use llvm Option's new Visibility flags are a big change and provide mechanical instructions to help resolve the conflicts that they’re likely to cause. Hope that helps, feel free to reach out if you run into problems with the update scripts.