[Bug demangler/78944] null pointer in demangler

[vanyacpp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78944

--- Comment #1 from Ivan Sorokin <vanyacpp at gmail dot com> ---
In addition to the reported crash on _Z3fooAv32pM, there are two other seeming
unrelated crashes: _Z1f7729646840 and _Z1fDpDF02s4o.