Amend the handling of c-laomib-cache.

Amend the handling of c-laomib-cache.

There was unstable syntactic analysis of lines which were brace
lists.  This fixes bug#64133.

* lisp/progmodes/cc-engine.el (c-laomib-cache): Allow several
entries with the same LIM element corresponding to distinct
scanning regions.
(c-laomib-get-cache): Add new parameter START.  Adjust to be
able to have entries with the same LIM element and handle them
correctly.
(c-laomib-put-cache): Amend the handling of cache entries with
the same LIM element.
(c-looking-at-or-maybe-in-bracelist): Supply the needed new
argument to c-laomib-get-cache.  Add in a new call to
c-laomib-put-cache.