message: global_heap: remove unused MeshArguments struct
diff: @@ -74,11 +74,6 @@ private:
  static_assert(HL::gcd<MmapHeap::Alignment, Alignment>::value == Alignment,
  "expected MmapHeap to have 16-byte alignment");
  - struct MeshArguments {
  - GlobalHeap *instance;
  - internal::vector<std::pair<MiniHeap *, MiniHeap *>> mergeSets;
  - };
  -
  public:
  enum { Alignment = 16 };
  