[Bug demangler/85122] Stack Overflow(Stack Exhaustion) in demangle related functions

[mudongliangabcd at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85122

--- Comment #1 from 慕冬亮 <mudongliangabcd at gmail dot com> ---
Created attachment 43800
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43800&action=edit
PoC to trigger stack exhaustion