Add more noreturn attributes

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> The appended patch silences most of the "function might be possible
> candidate for attribute `noreturn'" warnings from GCC.

OK.

> I've got one question about thread_func in
> linuxthreads/sysdeps/pthread/timer_routines.c which has a while (1)
> loop.  Can it ever return?  gcc issues the noreturn warning.

I cannot return.  And the unlock call can go therefore.

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