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

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

I see a benefit in renaming folders like "Tools" and "Tests" to "LLVM Tests" and "LLVM Tools", but I really don't think having folders within folders is a good UI for regular projects: it'll mean extra clicking in the solution explorer just to get to the file you want (a process which is already a bit suboptimal as it is), for no real added benefit when you can just make the folders top-level and named to distinguish subprojects.

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