c-renarrow-state-cache: take care when new point is inside old brace pair.

c-renarrow-state-cache: take care when new point is inside old brace pair.

Also add display of point-min to the c-parse-state debugging output.

* lisp/progmodes/cc-engine.el (c-renarrow-state-cache): When the new
point is inside an old recorded brace pair, clear the cache.
(c-debug-parse-state): Output the value of point-min.