[llvm] [llvm] Revise IDE folder structure (PR #89741)

[James Henderson via llvm-commits]

jh7370 wrote:

Okay, I'm going to take a step back from reviewing this - I'm no longer opposed to the subfolders, but I also don't have enough knowledge of the different LLVM components to be able to reasonably review whether any given folder is the right place for a project.

https://github.com/llvm/llvm-project/pull/89741