Use operator new/delete directly on ExpressionNode

tree_node.cpp

@@ -0,0 +1,16 @@
+#include "tree_node.h"
+#include "expression_node.h"
+
+void TreeNode::release() {
+  m_referenceCounter--;
+  for (TreeNode * child : directChildren()) {
+    child->release();
+  }
+  if (m_referenceCounter == 0) {
+    printf("DELETE %d(%p)\n", m_identifier, this);
+    delete this;
+    //dealloc();
+    printf("Will log\n");
+    ExpressionNode::Pool()->log();
+  }
+}