message: Use TRACE instead of trace
  Summary: `trace` function is not exported if `NDEBUG`.
diff: @@ -155,7 +155,7 @@ Stats merge_methods(const MethodGroups& method_groups,
  Stats stats;
  auto all_methods = methodgroups_to_methodset(method_groups);
  if (all_methods.empty()) {
  - stats;
  + return stats;
  }
  method_reference::CallSites callsites =
  method_reference::collect_call_refs(scope, all_methods);
  @@ -178,11 +178,11 @@ Stats merge_methods(const MethodGroups& method_groups,
  new_callee.additional_args.get()[0], SHOW(new_callee.method));
  }
  if (traceEnabled(METH_MERGER, 3)) {
  - trace(METH_MERGER, 3, "merged static methods : %u\n",
  + TRACE(METH_MERGER, 3, "merged static methods : %u\n",
  stats.num_merged_static_methods);
  - trace(METH_MERGER, 3, "merged direct methods : %u\n",
  + TRACE(METH_MERGER, 3, "merged direct methods : %u\n",
  stats.num_merged_direct_methods);
  - trace(METH_MERGER, 3, "merged virtual methods : %u\n",
  + TRACE(METH_MERGER, 3, "merged virtual methods : %u\n",
  stats.num_merged_nonvirt_methods);
  }
  return stats;
  