cl-types.el: Speed up deftype and dispatch

* lisp/emacs-lisp/cl-types.el (cl--type-list): Doc string.
(cl--type-dispatch-list): New variable.
(cl--type-parents): Make it a plain defun.
(cl--type-children, cl--type-dag): Remove.
(cl--type-undefine): Remove duplicate test for `cl--type-p'.  Use
`cl--class-children'.  Clear `cl--type-flag' instead of
`cl--type-error'.  Also remove type from the dispatch list.
(cl--type-deftype): Doc string.  Remove useless safeguard of
data on error.  Fix some error messages.  Clear `cl--type-flag'
when a type is (re)defined.  Just push new types on
`cl--type-list'.
(cl--type-error): Set `cl--type-flag' to the symbol `error' and
remove type in error from the dispatch list.
(cl-types-of): Doc string.  Remove useless check for
`cl-type-class-p'.  Skip types which we are sure will not match.
Simplify creation of the DAG.
(cl--type-generalizer): In the tagcode-function, check only types
that can be dispatched.
(cl-generic-generalizers): Populate the dispatch list.

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