[clang] [Driver] Remove a bunch of unnecessary REQUIRES constraints (PR #94055)

[Joseph Huber via cfe-commits]

https://github.com/jhuber6 approved this pull request.

I've wondered about these as well, there might also be some OpenMP tests that have `requries powerpc-registered-target` or similar  that could be removed. I guess we'll see what  the CI thinks with this patch.

https://github.com/llvm/llvm-project/pull/94055