message: Remove redundant check from drop_operand
diff: @@ -119,8 +119,11 @@ inline void drop_operand(
  static_cast<int>(operand_stack.size()) < frame.parent_stack_height + 1)
  throw validation_error{"stack underflow"};
  - if (frame.unreachable && static_cast<int>(operand_stack.size()) == frame.parent_stack_height)
  + if (static_cast<int>(operand_stack.size()) == frame.parent_stack_height)
  + {
  + assert(frame.unreachable); // implied from stack underflow check above
  return;
  + }
  const auto actual_type = operand_stack.pop();
  if (expected_type.has_value() && actual_type != *expected_type)
  