Also amend some pertinent documentation. This fixes bug #23818.
* lisp/progmodes/cc-engine.el (c-beginning-of-decl-1): Also check for a
virtual semicolon at a place where we check for other types of statement ends.
* lisp/progmodes/cc-vars.el (c-macro-nacmes-with-semicolon): Remove from the
doc string the bit saying that the variable is a prototype and liable to
change.
* doc/misc/cc-mode.texi (Macros with ;): Enhance, stating that configuring
macros with semicolon can prevent C-M-a missing the beginning of defun.
681d3f1f58