[llvm] [llvm-cgdata] Remove GENERATE_DRIVER option (PR #100077)

[Ellis Hoag via llvm-commits]

ellishg wrote:

Is there any discussion or docs about `Opt` vs `cl`? Are there plans to deprecate `cl` in the future? For a simple tool like this, I appreciate the simplicity of `cl` since all the code lives in one file and subcommands are handled really well.

If we must use `Opt`, maybe we can first detect the subcommand and parse the tool different depending on that subcommand. This might require duplicate code for options that are shared between subcommands.

https://github.com/llvm/llvm-project/pull/100077