fix weakref tests for alpha

[Hans-Peter Nilsson]

On Thu, 17 Nov 2005, Alexandre Oliva wrote:
> On Nov 16, 2005, Richard Henderson <rth@redhat.com> wrote:
>
> > Alpha assembly obsconds with .set for other purposes.
> > As far as I know, = means the same thing everywhere.
>
> 'fraid not, I'd used it initially, and was asked to change it because
> some ports didn't support it.

(raises hand)
Um, MMIX, where these tests used to PASS...

>  Maybe .equ or .equiv would give us more
> portability?

Looking at read.c, (only) the generic .equ is a synonym for the
generic .set, but tc-hppa.c and tc-tic4x.c redefines them
incompatibly.  Maybe a new pseudo?

If you must, please skip these tests for MMIX.

brgds, H-P