(gud-find-c-expr): Renamed from find-c-expr.

(gud-find-c-expr): Renamed from find-c-expr.
Don't get fooled by if and while statements.
(gud-expr-compound): Renamed from expr-compound.
(gud-expr-compound-sep): Renamed from expr-compound-sep.
(gud-next-expr): Renamed from expr-next.
(gud-prev-expr): Renamed from expr-prev.
(gud-forward-sexp): Renamed from expr-forward-sexp.
(gud-backward-sexp): Renamed from expr-backward-sexp.
(gud-innermost-expr): Renamed from expr-cur.