CC Mode: Fix two bugs in the "state cache".

CC Mode: Fix two bugs in the "state cache".

This (along with a suggestion to the OP to set
open-paren-in-column-0-is-defun-start to nil) fixes bug #37910.  It may also
have fixed bug #5490 and bug #18072.

* lisp/progmodes/cc-engine.el (c-state-cache-non-literal-place): Remove thi
non-sensical function, replacing it with ....
(c-state-cache-lower-good-pos): New function.
(c-renarrow-state-cache, c-append-lower-brace-pair-to-state-cache)
(c-remove-stale-state-cache, c-remove-stale-state-cache-backwards): Instead of
altering the state-cache list structure with setcar and setcdr, use setq and
consing.
(c-parse-state-1): Call c-state-cache-lower-good-pos rather than
c-state-cache-non-literal-place.