int64_t cumulative_compile_time_us = 0;

    // True if we have decided that this cluster is too dynamic (i.e. its shapes
    // change too frequently) to profitably JIT compile.  Once a cluster is
    // tagged megamorphic, it stays megamorphic forever.
    bool is_megamorphic = false;

    std::string DebugString() const {
      return absl::StrCat(
          "DeviceCompilationProfiler::ClusterCompileStats {compile_count=",

  // The is_megamorphic bit is "sticky".  We assume clusters that have been
  // observed to be megamorphic once stay megamorphic forever.
  if (!stats->is_megamorphic &&
      ShouldBeMegamorphic(stats->compile_count, stats->execution_count)) {
    VLOG(1) << "Marking " << function.name()
            << " as megamorphic, compile_count=" << stats->compile_count
            << " execution_count=" << stats->execution_count;