[llvm] [TySan] A Type Sanitizer (LLVM) (PR #76259)

[Florian Hahn via llvm-commits]

fhahn wrote:

Just rebased again on top of current `main`.

Would be great if we could get this in, as multiple people including @gbMattN and I think @tavianator would be interested in making improvements. As is, it is already useful (it catches a number of type-based alias violations in issues submitted by users https://discourse.llvm.org/t/reviving-typesanitizer-a-sanitizer-to-catch-type-based-aliasing-violations/66092/11) and having it in `main` would allow more people to improve the sanitizer more quickly

https://github.com/llvm/llvm-project/pull/76259