- Fixes https://github.com/llvm/llvm-project/issues/163369
- Segmentation fault occurred because resolver was calling TSan
instrumentation functions (__tsan_func_entry, __tsan_func_exit) but as
the resolver is run by the dynamic linker at load time, TSan is not
initialized yet so the current thread pointer is null.
- This PR adds the DisableSanitizerInstrumentation attribute to the
multiversion function resolvers to avoid issues like this.
- Added regression test for TSan segfault.
0ff0892470