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

[via llvm-commits]

alexfh wrote:

The recommit (ddcbab37ac0e5743a8d39be3dd48d967f4c85504) causes the compiler-rt/test/tsan/signal_sync2.cpp test to be flaky on x86-64 linux (~25 failures in 1000 runs).

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