message: Handle case of 0 physical cores reported
  When it is unknown manufacturer the physical cores could be reported as 0. Hanfdle this case in the pipeline setup.
diff: @@ -177,7 +177,10 @@ void pipelineBuilder(OpPassManager &pm) {
  // Use OMP thread count
  unsigned maxThreads = omp_get_max_threads();
  unsigned physCores = getPhysicalCoreNumber();
  + if (0 != physCores) {
  maxThreads = std::min(physCores, maxThreads);
  + }
  +
  pm.addPass(pxa::createCPUThreadPass(maxThreads));
  pm.addPass(pxa::createAffineNormalizePass());
  