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

[Marco Elver via llvm-commits]

melver wrote:

> yeah, reproducing the issue on a power machine is taking me some time.

You may revert the change until then, and then recommit with the fix. This is our usual practice if it takes too long to come up with the fix.

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