libcxxabi, libcxx, and libunwind patches from MacPorts

[Jeremy Huddleston Sequoia]

I'd like to upstream a few patches that I put together for libcxxabi, libcxx, and libunwind in MacPorts.

This first series is for libcxx:

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And this second series is for libcxxabi (mostly libunwind).


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I don't have commit access to the svn repository, so if someone could push these after review, I'd appreciate it.

Thanks,
Jeremy