Sanitizers incompatible with depends_on_llvm

[aaronmondal]

We are missing #include <sanitizer/msan_interface.h>. Probably caused by drift from upstream. Should be easy to fix.

[aaronmondal]

Magically fixed itself when bumping LLVM 😆

[aaronmondal]

Nope, still occurs

[neqochan]

The issue only occurs when using depends_on_llvm, since the original LLVM overlay doesn't include the compiler-rt headers. A simple solution may be to just patch the overlay. I'm not sure whether it is trivial to upstream such a change though since upstream doesn't have an overlay for compiler-rt at all.

[aaronmondal]

This is becoming a larger issue. The ROCm stack depends on LLVM so we can't sanitize it at the moment. We should fix this as soon as we have more test coverage around ROCm so that we can run a sanitized test suite.