[Bug demangler/68159] Demangler crash (GDB PR 19190)

[cbiesinger at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68159

--- Comment #17 from Christian Biesinger <cbiesinger at google dot com> ---
Sorry, rather, none of these testcases seem to crash anymore but the one from
comment 0 still does not demangle.