(pcase-mutually-exclusive): Use auto-generated table

(pcase-mutually-exclusive): Use auto-generated table

The `pcase-mutually-exclusive-predicates` table was not very
efficient since it grew like O(N²) with the number of
predicates.  Replace it with an O(N) table that's auto-generated
from the `built-in-class` objects.

* lisp/emacs-lisp/pcase.el (pcase-mutually-exclusive-predicates):
Delete variable.
(pcase--subtype-bitsets): New function and constant.
(pcase--mutually-exclusive-p): Use them.
* lisp/emacs-lisp/cl-preloaded.el (built-in-class): Don't inline.