codegen: Reduce get_delegate_target/get_delegate_target_destroy_notify calls
codegen: Reduce get_delegate_target/get_delegate_target_destroy_notify calls

GNOME/vala,frida/vala,frida/vala,GNOME/vala,frida/vala,GNOME/vala,frida/vala,GNOME/vala,frida/vala