PATCH: Add gold support for TLS descriptors

[Cary Coutant]

> This implementation is incorrect::
>
> http://sourceware.org/bugzilla/show_bug.cgi?id=11063
>
> You can run tests on Fedora 11/12.

Yeah, I know -- Alexandre already pointed that out to me a long time
ago. I'll try to get to it soon. Thanks for the pointer to Fedora -- I
really didn't want to deal with building my own glibc for testing
this!

-cary