[FYI] Ongoing discussion on llvm-dev: "One or many git repositories?"

We're having a discussion on the following question on llvm-dev:

Assuming we switch our canonical VCS to git, then
  - should we have one git repository per llvm subproject, or
  - should we have a single monolithic git repository.


This will affect all of us, so I wanted to loop in these lists.
Please respond on llvm-dev, not here, so we don't fork the thread.