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

[Dmitry Vyukov via llvm-commits]

dvyukov wrote:

For raw syscalls sanitizers provide [these hooks](https://github.com/llvm/llvm-project/blob/main/compiler-rt/include/sanitizer/linux_syscall_hooks.h), but they need to be inserted manually into code.

Potentially tsan can be made to delay signals only for the duration of a single runtime callback, but that's a large endeavor and it's not completely clear how to do it.

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