message: Fix undefined memory access
  Summary: For whatever reason, the next diff in the stack brought out the issue.
diff: @@ -1307,6 +1307,9 @@ VirtualMergingStats apply_ordering(
  auto last_it = block->end();
  for (auto it = block->begin(); it != block->end(); it++) {
  auto& mie = *it;
  + if (mie.type != MFLOW_OPCODE) {
  + continue;
  + }
  if (!opcode::is_a_load_param(mie.insn->opcode())) {
  break;
  }
  