SCRIPT: Now correctly setting the IrRoot in all its contained elements

src/Lib/Script/Ast/IrElement.cc

 #include <vector>
 #include "IrElement.hh"
+#include "IrRoot.hh"
 #include "IrAttribute.hh"
 
 namespace Vivy::Script
 {
-IrElement::IrElement(IrElement *p) noexcept { setParent(p); }
+IrElement::IrElement(IrElement *p) noexcept
+{
+    setParent(p);
+    parentRoot = parent()->irRoot();
+    if (parentRoot == nullptr)
+        parentRoot = dynamic_cast<IrRoot *>(this);
+}
 
 void
 IrElement::throwUnexpectedToken(const Token &tok) const