/// If the GlobalValue is read in, and if the GVMaterializer supports it,
/// release the memory for the function, and set it up to be materialized
/// lazily. If !isDematerializable(), this method is a noop.
/// If the GlobalValue is read in, and if the GVMaterializer supports it,
/// release the memory for the function, and set it up to be materialized
/// lazily. If !isDematerializable(), this method is a noop.