[clang] [llvm] [clang] Add support for the c2000 architecture (PR #125663)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman requested changes to this pull request.

Marking this as requesting changes so we don't accidentally land it. The discussion on the RFC is still going and there may not be consensus to move forward with this PR, so I'd like to see that discussion resolved before we land anything.

https://github.com/llvm/llvm-project/pull/125663