* emacs-lisp/eieio-generic.el: New file.

* emacs-lisp/eieio-generic.el: New file.

* lisp/emacs-lisp/eieio-core.el: Move all generic function code to
eieio-generic.el.
(eieio--defmethod): Declare.
* lisp/emacs-lisp/eieio.el: Require eieio-generic.  Move all generic
function code to eieio-generic.el.
* lisp/emacs-lisp/eieio-opt.el (eieio-help-generic): Move to
eieio-generic.el.
* lisp/emacs-lisp/eieio-datadebug.el (eieio-debug-methodinvoke): Update call
to eieio--generic-call.
* lisp/emacs-lisp/eieio-base.el (eieio-instance-inheritor): Don't use
<class>-child type.
* test/automated/eieio-test-methodinvoke.el (eieio-test-method-store):
Update reference to eieio--generic-call-key.
* test/automated/eieio-tests.el (eieio-test-23-inheritance-check): Don't use
<foo>-child-p.