[Bug 243746] llvm-libunwind does not provide an API useful in signal handler context

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243746

--- Comment #2 from Conrad Meyer <cem at freebsd.org> ---
Here is the WIP:
https://people.freebsd.org/~cem/libexecinfo.backtrace_ctx3.patch

It works on amd64 (not tested recently) and maybe i386 (untested) and does not
have support for other architectures.  It is mostly missing tests, I think.
Otherwise it just needs rebasing on the current tree, and eventually it will be
nice to support non-x86 architectures.

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