message: Check for duplicate methods
  Summary: The same `MethodRef` pointer should never appear twice.
diff: @@ -1173,6 +1173,7 @@ void PassManager::run_passes(DexStoresVector& stores, ConfigFiles& conf) {
  auto post_pass_verifiers = [&](Pass* pass, size_t i, size_t size) {
  ConcurrentSet<const DexMethodRef*> all_code_referenced_methods;
  + ConcurrentSet<DexMethod*> unique_methods;
  walk::parallel::code(build_class_scope(stores), [&](DexMethod* m,
  IRCode& code) {
  // Ensure that pass authors deconstructed the editable CFG at the end of
  @@ -1192,6 +1193,9 @@ void PassManager::run_passes(DexStoresVector& stores, ConfigFiles& conf) {
  SHOW(m));
  all_code_referenced_methods.insert(mref);
  }
  + if (!unique_methods.insert(m)) {
  + not_reached_log("Duplicate method: %s", SHOW(m));
  + }
  }
  });
  if (slow_invariants_debug) {
  