[compiler-rt] [compiler-rt][rtsan] Introduce first end to end RTsan lit tests, enable instrumented unit tests (PR #105732)

[via llvm-commits]

Prabhuk wrote:

Some observations from our team in our early investigation:

- libclang_rt.atomic.so is not linked in for the test binaries.
- We don't see `-latomic` in the link even though cmake file for the test seems to try to set it: https://github.com/llvm/llvm-project/blob/0359b9a2306566a872cede1fcdaa4edc34e9398e/compiler-rt/lib/rtsan/tests/CMakeLists.txt#L39

We suspect the problem here could be with detection of `COMPILER_RT_HAS_LIBATOMIC`.





https://github.com/llvm/llvm-project/pull/105732