[Bug 222562] c++filt and libelftc do not demangle names correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222562

--- Comment #1 from Ed Maste <emaste at freebsd.org> ---
GNU c++filt demangles the 2nd as `typeinfo name for main::Bar`

Related test case _ZZ4mainE3Bar, which GNU demangles as main::Bar and
elftoolchain's fails with an assertion:

% c++filt _ZZ4mainE3Bar 
Assertion failed: (ddata->output.size > 0), function cpp_demangle_read_sname,
file
/usr/home/emaste/src/freebsd-wip/contrib/elftoolchain/libelftc/libelftc_dem_gnu3.c,
line 2139.

The assertion failure can also be triggered attempting to demangle (invalid)
symbol _ZZ1

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