[clang] [flang] [Flang][Sanitizer] Support sanitizer flag for Flang Driver. (PR #137759)

[Tarun Prabhu via cfe-commits]

https://github.com/tarunprabhu requested changes to this pull request.

Thanks. We should try to share code between `clang` and `flang` where appropriate.

https://github.com/llvm/llvm-project/pull/137759