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

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

Something special about powerpc, can you please take a look?
https://lab.llvm.org/buildbot/#/builders/18/builds/15903
https://lab.llvm.org/buildbot/#/builders/19/builds/25447

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