message: Fixing heap-use-after-free...
  Summary: ... which was intropduced by (https://github.com/facebook/redex/commit/04a12ac15e65c5d5ac24282b924dac4bc3885943)
diff: @@ -424,6 +424,9 @@ size_t CrossDexRefMinimizer::erase(DexClass* cls, bool emitted, bool reset) {
  continue;
  }
  m_applied_refs.emplace(ref);
  + if (frequency == 0) {
  + continue;
  + }
  for (DexClass* affected_class : classes) {
  affected_classes[affected_class].applied_refs_weight += weight;
  }
  