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

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67264
Bug 67264 depends on bug 70909, which changed state.

Bug 70909 Summary: Libiberty Demangler segfaults (4)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70909

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED