[clang] [lldb] [llvm] [clang] Split out DebugOptions.def into its own top-level options group. (PR #75530)

[Juergen Ributzka via cfe-commits]

ributzka wrote:

> This looks pretty nice, I left just a couple of notes. You might want to take a look at the CI failures.

Thanks Jan, I will take a look. At first glance I need to build and fix `flang` too.

https://github.com/llvm/llvm-project/pull/75530