llvm-project

10c6ebc4 - Reapply "[Clang] [NFC] Introduce a helper for emitting compatibility diagnostics (#132348)" (#134043)

Reapply "[Clang] [NFC] Introduce a helper for emitting compatibility diagnostics (#132348)" (#134043) This reapplies #132348 with a fix to the python bindings tests, reverting https://github.com/llvm/llvm-project/commit/076397ff3217cf45fd08024dd7bcd2bc8fb229ab.