TLS stuff

[Ulrich Drepper]

I've checked i a first batch of thread-local storage related changes.
Nothing works yet, it's just the beginning.  But it is time to get the
ABIs hammered out for anything but ia64, x86, and sparc.

Those who are watching the todo list might have seen a new item for
the tls integration.  The description of it contains a reference of
the TLS document I wrote.  It's reasonable complete and usable though
there will be changes.  Give it a read and create the ABIs for your
platform.  It's really time now.

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