message: add timer to track how long the re-ordering takes
  Summary: As in the title.
diff: #include <unordered_set>
  #include "DexClass.h"
  +#include "Timer.h"
  /**
  * Method ordering based on code similarity. Methods are selected one after
  @@ -67,6 +68,7 @@ class MethodSimilarityOrderer {
  DexMethod* get_next();
  static void order(std::vector<DexMethod*>& methods) {
  + Timer t("Reordering methods by similarity");
  MethodSimilarityOrderer mso(methods);
  methods.clear();
  