[clang] [flang] [llvm] [polly] [Plugins] Pass options to a pass plugin in -load-pass-plugin (PR #226773)

[Fangrui Song via llvm-commits]

MaskRay wrote:

This PR removes all uses of CommandLine.h:`setCallback` outside of mlir/. (MLIR currently relies on it due to some non-standard questionable usage of llvm::cl.... @joker-eph )

https://github.com/llvm/llvm-project/pull/226773