[clang] [WIP][DO NOT MERGE][Clang][Driver] Emit warning when -fsanitize-trap=<...> is passed without associated -fsanitize=<...> (PR #147997)

[Fangrui Song via cfe-commits]

MaskRay wrote:

Thank you for your efforts to enhance sanitizers. However, the current implementation aligns with the preferences of many, including GCC contributors who introduced -fsanitize-trap in 2022. Gaining consensus to modify -fsanitize-trap to issue warnings or errors seems unlikely, so closing this issue appears to be the appropriate action.

The proposed change could serve an educational purpose by illustrating modifications to the driver and sanitizer components. However, pursuing its development within llvm/llvm-project risks causing confusion among contributors.

https://github.com/llvm/llvm-project/pull/147997