(Rosebud) Fixed warnings when NDEBUG is defined

RPM-357

src/ROSETTA/Grammar/Node.code

@@ -1886,6 +1886,7 @@ public:
  T* initParentPointer(T *child, SgNode *parent) {
  ASSERT_not_null(parent);
  if (child) {
+#ifndef NDEBUG
  auto toString = [](SgNode *node) {
  if (node) {
  return (boost::format("(%s*)%p") % node->class_name() % node).str();
@@ -1898,6 +1899,7 @@ public:
  "child " + toString(child) +
  " cannot be inserted into " + toString(parent) +
  " because it is already a child of " + toString(child->get_parent()));
+#endif
  child->set_parent(this);
  }
  return child;
@@ -1944,13 +1946,15 @@ public:
  std::is_pointer<T>::value,
  void>::type
  changeChildPointer(T& edge, T const& child) {
+#ifndef NDEBUG
  auto toString = [](SgNode *node) {
  if (node) {
  return (boost::format("(%s*)%p") % node->class_name() % node).str();
  } else {
  return std::string("nullptr");
  }
  };
+#endif
 
  if (child != edge) {
  // If there is an old child, check that it has the correct parent and then remove it.