[clang] [clang-tools-extra] [flang] [lldb] [llvm] [clang] Refactor option-related code from clangDriver into new clangOptions library (PR #163659)

[Naveen Seth Hanig via cfe-commits]

naveen-seth wrote:

> > The goal of this change is to remove dependencies on the Driver.
> 
> This part of PR description led me to believe that you're going to replace some `clangDriver` dependencies with `clangOptions`, but I only saw you adding `clangOptions` to various CMakeLists. I guess description can be improved here (or my understanding, if I missed something).
> 
> It seems that this PR is requiring downstream users who link with `clangDriver` to also link with `clangOptions`. Because of this, I don't consider this to be an NFC change, and would like to see a release note in "Potentially breaking changes" section.
> 
> I'd like @AaronBallman to sign this off before it's merged. He should be back next week.

Thank you for reviewing! I’ve added the release note ([ae268d0](https://github.com/llvm/llvm-project/pull/163659/commits/ae268d0ead9d744cea016166cc04a21dae875c96)) and updated the PR title and description.

https://github.com/llvm/llvm-project/pull/163659