message: Change the cross-store violation warning to TRACE 0
  Summary: So we can hide the stderr output if we want. It's on by default because we have trace on.
diff: @@ -294,10 +294,10 @@ void AnalysisImpl::escape_cross_stores() {
  if (cls != nullptr) {
  if (xstores.illegal_ref_load_types(intf_it.first, cls)) {
  escape_interface(intf_it.first, CROSS_STORES);
  - std::cerr << "Warning: found " << show(cls)
  - << " which is by itself not a cross-store violation for "
  - << show(intf_it.first)
  - << ", but depends on other types that are!" << std::endl;
  + TRACE(INTF, 0,
  + "Warning: found %s which is by itself not a cross-store "
  + "violation for %s but depends on other types that are!",
  + SHOW(cls), SHOW(intf_it.first));
  continue;
  }
  }
  