libc-internal thread-specific data revamp

[Ulrich Drepper]

Roland McGrath <roland@frob.com> writes:

> The following patches revamp the facilities for libc-internal
> thread-specific data used by malloc and the dynamic linker.

Thanks, I've applied the patch.

The only place where I can see possible problems is with replacing the
weak undefined symbols with the .bss/.data trick.  It works for all
platforms we are currently interested in and here only since we don't
support dynamically loading libpthread.  So it's in for now but we
should keep the eyes open for possible situations where this leads to
problems.

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