No cl-lib replacement for define-modify-macro?

[Glenn Morris]

It seems that there is no cl-lib replacement for cl.el's define-modify-macro.
(I can't really see anything in gv.el that would replace it either.)
Is that intentional (because it is believed to be unused)?
It looks like cl-define-modify-macro would have exactly the same
definition as define-modify-macro, so I can't see a reason not to simply
move it to cl-lib.el and add an alias in cl.el.