[clang] [compiler-rt] [compiler-rt] Realtime Sanitizer: Introduce Realtime Sanitizer (RTSan) backend (PR #92460)

[Fangrui Song via cfe-commits]

MaskRay wrote:

> In the meantime, I commented out compilation of our unit tests that required the -fsanitize flag, let me know if you'd prefer to see them removed until later. These unit tests are paired with the code introduced here, so I think at least by subject it makes sense to introduce them here, even if they are briefly not being compiled.

Yeah, disabling the testsuite should be safe. The tests can be enabled after clangCodeGen and clangDriver patches landed.

https://github.com/llvm/llvm-project/pull/92460