thread-ready ABIs

[Ulrich Drepper]

Geoff Keating <geoffk@geoffk.org> writes:

> It is currently reserved for the system.  I believe some programs use
> it, but not many.

Let's start by modifying the current linuxthreads code to use this
register then.  This is not how it necessarily has to work in future
but it'll help shaking out problems.  Just define the few needed
macros in pt-machine.h.

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