message: poplar T3205 removed the need for this
  Summary:
  We no longer need to pretend the device has fewer tiles as compilation and
  linking is now fast enough, and doesn't link tiles which have no content.
  Test Plan: python unit tests on hardware
  Reviewers: georgep
diff: @@ -301,11 +301,6 @@ Status PoplarExecutor::ConfigurePoplarDevice(
  if (d.attach()) {
  poplar_device_ = d;
  - // Temporary fix to prevent many long compilation times
  - if (tiles_per_ipu == 0) {
  - tiles_per_ipu = 8;
  - }
  -
  if (tiles_per_ipu > 0) {
  poplar_device_ =
  poplar_device_.createVirtualDevice(tiles_per_ipu);
  