message: Fix issue with updating instruction labels
  Previously, updateInstructionLabels could be called with the
  expectation of a new processor having been loaded, before the labels
  for the new processor stages were initialized.
diff: @@ -188,6 +188,7 @@ void ProcessorTab::loadProcessorToWidget(const Layout& layout) {
  stagelabel->boundingRect().height());
  m_stageInstructionLabels[i] = stagelabel;
  }
  + updateInstructionLabels();
  }
  void ProcessorTab::processorSelection() {
  @@ -261,9 +262,9 @@ void ProcessorTab::enableSimulatorControls() {
  void ProcessorTab::updateInstructionLabels() {
  const auto& proc = ProcessorHandler::get()->getProcessor();
  - for (unsigned i = 0; i < proc->stageCount(); i++) {
  - const QString instr = ProcessorHandler::get()->parseInstrAt(proc->getPcForStage(i));
  - m_stageInstructionLabels.at(i)->setText(instr);
  + for (const auto& il : m_stageInstructionLabels) {
  + const QString instr = ProcessorHandler::get()->parseInstrAt(proc->getPcForStage(il.first));
  + il.second->setText(instr);
  }
  }
  