[compiler-rt] [compiler-rt] Also consider SIGPROF as a synchronous signal (PR #85188)

[Dmitry Vyukov via llvm-commits]

dvyukov wrote:

> Yeah, tbh even though this PR wasn't "technically correct", I was happy to have it because current async signal implementation in TSan looks pretty flaky. We have encountered these 2 functions that are marked incorrectly while testing the Firefox Profiler, but there is no guarantee that we would not encounter another one in the future (or when these are solved).

I would say signal handling is the single major source of problems and fixes for tsan.

https://github.com/llvm/llvm-project/pull/85188