[Bug other/67264] Infinite recursion of demangler on fuzzed input

[miyuki at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67264

--- Comment #2 from Mikhail Maltsev <miyuki at gcc dot gnu.org> ---
Created attachment 36211
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36211&action=edit
Script for testcase reduction