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

[via llvm-commits]

serge-sans-paille 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.

ok. I have a fix that works locally, but we're never sure. I'll sumit it and if it doesn't fixes the test case on our buildbot I'll revert.

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