We really need some kind of more sophisticated assert macro that can be
switched to non-fatal logging mode for release builds. A log message, which is
often all that would happen, is a lot better than a trainwrecked performance...
git-svn-id: svn://localhost/ardour2/branches/3.0@13892 d708f5d6-7413-0410-9779-e7cbd77b26cf