s390 TLS incorporated

[Ulrich Drepper]

I've added Martin's TLS stuff to the TLS document.  Version 0.18
includes it.  Please check it out.  A _lot_ of editing was necessary so
I might have screwed something up.

And on more thing: it would be good if the code sequences would get
pseudo addresses just for the other archs.  Otherwise it's not
necessarily obvious how long an instruction has to be.

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