[clang] [Clang][Driver] Add an option to control loop-interchange (PR #125830)

[Michael Kruse via cfe-commits]

Meinersbur wrote:

The other optimzation pass options (unrolll, vectorize, ...) are implemented in `PipelineTuningOptions` and `CodeGenOptions.def`. Do it the same way? 

https://github.com/llvm/llvm-project/pull/125830