[clang-tools-extra] [llvm] [clang-tools-extra] Revise IDE folder structure (PR #89744)

[Michael Kruse via llvm-commits]

Meinersbur wrote:

> This is basically names passed as FOLDER property are very generic. 

They are a little more specific than before (especially when considering Compiler-RT which put everything into "Compiler-RT/Misc"). Being more contextual would also require more maintenance, e.g. adding the right folder name for new artifacts. Only users of CMake's XCode or Visual Studio generators even see then, other would not even know something is off when this is not done. Hence the goal was to reduce maintenance, i.e. `add_clang_library` selects the folder name itself. It only has the type of the target available (here: library), so that's what it is restricted to.

> Then this change is +- fine.

Thank you


https://github.com/llvm/llvm-project/pull/89744