[Bug 252443] c++filt demangles particular C++ symbol wrong

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252443

            Bug ID: 252443
           Summary: c++filt demangles particular C++ symbol wrong
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: yuri at freebsd.org
 Attachment #221301 text/plain
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Created attachment 221301
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221301&action=edit
testcase-templated-method.cpp

Wrong (ccc is called with G<bool>, not G<CO>):
> $ nm testcase-templated-method.o | grep ccc | c++filt
>                  U void G<CO>::ccc<bool>(G const&<CO>)


Correct with c++filt from devel/binutils:
> $ nm testcase-templated-method.o | grep ccc | /usr/local/bin/c++filt
>                  U void G<CO>::ccc<bool>(G<bool> const&)

Correct with llbm's c++filt:
> $ nm testcase-templated-method.o | grep ccc | /usr/local/llvm10/bin/llvm-cxxfilt
>                  U void G<CO>::ccc<bool>(G<bool> const&)

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