message: Increase mark set size
  Summary: Increasing to 127 lowers profiled lock overhead.
diff: @@ -143,9 +143,23 @@ class ReachableObjects {
  void record_reachability(const DexMethodRef* member, const DexClass* cls);
  - ConcurrentSet<const DexClass*> m_marked_classes;
  - ConcurrentSet<const DexFieldRef*> m_marked_fields;
  - ConcurrentSet<const DexMethodRef*> m_marked_methods;
  + static constexpr size_t MARK_SLOTS = 127;
  +
  + ConcurrentSet<const DexClass*,
  + std::hash<const DexClass*>,
  + std::equal_to<const DexClass*>,
  + MARK_SLOTS>
  + m_marked_classes;
  + ConcurrentSet<const DexFieldRef*,
  + std::hash<const DexFieldRef*>,
  + std::equal_to<const DexFieldRef*>,
  + MARK_SLOTS>
  + m_marked_fields;
  + ConcurrentSet<const DexMethodRef*,
  + std::hash<const DexMethodRef*>,
  + std::equal_to<const DexMethodRef*>,
  + MARK_SLOTS>
  + m_marked_methods;
  ReachableObjectGraph m_retainers_of;
  friend class RootSetMarker;
  