[clang] [llvm] [clang][OpenMP] Shorten directive classification in ParseOpenMP (PR #94691)

[Mike Rice via cfe-commits]

https://github.com/mikerice1969 commented:

I both like and hate the huge fully-covered switches we have. I like when I add new directives and know exactly where to add code. I hate having to read code like this though. Seems like this is going in the right direction.

https://github.com/llvm/llvm-project/pull/94691