message: do not run A/B experiments on ART builds
diff: #include <boost/program_options.hpp>
  #include <json/json.h>
  +#include "ABExperimentContext.h"
  #include "CommentFilter.h"
  #include "Debug.h"
  #include "DexClass.h"
  @@ -1091,6 +1092,11 @@ int main(int argc, char* argv[]) {
  auto const& passes = PassRegistry::get().get_passes();
  PassManager manager(passes, std::move(pg_config), args.config,
  args.redex_options);
  +
  + if (manager.get_redex_options().is_art_build) {
  + ab_test::ABExperimentContext::force_preferred_mode();
  + }
  +
  {
  Timer t("Running optimization passes");
  manager.run_passes(stores, conf);
  