message: Fix DCE instruction stats
  Summary:
  We had been counting all the MethodItemEntries, instead of just
  the instructions...
diff: @@ -193,10 +193,10 @@ class LocalDce {
  // Compute live-in for this block by walking its instruction list in
  // reverse and applying the liveness rules.
  for (auto it = b->rbegin(); it != b->rend(); ++it) {
  - m_total_instructions++;
  if (it->type != MFLOW_OPCODE) {
  continue;
  }
  + m_total_instructions++;
  bool required = is_required(it->insn, bliveness);
  if (required) {
  update_liveness(it->insn, bliveness);
  