[clang] [clang][UBSan] Make sure that the implicit-conversion group is compatible with minimal runtime (PR #114865)

[Richard Smith via cfe-commits]

https://github.com/zygoloid commented:

Please can you also add a test that we allow combining `-fsanitize=implicit-conversion` and `-fsanitize-minimal-runtime` so that this doesn't regress in a similar way in future?

(It'd be great if the test covered all the sanitizer groups that are currently compatible with the minimal runtime, so we get an early warning if we add any non-compatible sanitizers to those groups, but at minimum I'd like to see some test coverage for this change.)

https://github.com/llvm/llvm-project/pull/114865