pub fn sub_builder(&self) -> Self {
        Builder::<C>::new_sub_builder(
            self.variable_count(),
            self.nb_public_values,
            self.p2_hash_num,
            self.debug,
            self.program_type,
        )
    }
Convenience function for creating a new sub builder.
crates/recursion/compiler/src/ir/builder.rs