[HURD, PATCH] Fix stack switching at initialization time

[Ludovic Courtès]

Hello,

The attached patch fixes stack switching in init-first.c when cthreads
are used (this is for code compiled with a cross-GCC 4.5.1 for
i586-pc-gnu; Debian GNU/Hurd uses an older GCC and is not affected.)

With this compiler, ‘data[-1]’ does not point to the return address.
Thus, ‘switch_stacks’ would never be called, which breaks TLS.

It seems to me that using ‘data[-1]’ here was fragile in the presence of
nested functions, inlining, and tail-call optimizations.

Thanks,
Ludo’.

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