[Bug demangler/81680] Memory leak in demangle

[security-tps at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81680

--- Comment #1 from Google-Autofuzz <security-tps at google dot com> ---
Created attachment 41902
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41902&action=edit
Demangle PoC