* lisp/emacs-lisp/eieio-core.el: Provide support for cl-generic.

* lisp/emacs-lisp/eieio-core.el: Provide support for cl-generic.

(eieio--generic-tagcode): New function.
(cl-generic-tagcode-function): Use it.
(eieio--generic-tag-types): New function.
(cl-generic-tag-types-function): Use it.
(eieio-object-p): Tighten up the test.

* lisp/emacs-lisp/cl-generic.el (cl-generic-define-method): Fix paren typo.

* test/automated/eieio-test-methodinvoke.el (eieio-test-method-store): Add
keysym arg instead of relying on internal var eieio--generic-call-key.
Update all callers.
(eieio-test-cl-generic-1): New tests.