mn10300: don't accept `mov pc,r[0-7]'

[Alexandre Oliva]

Back in April last year, I added support for `mov pc,a[0-3]' to AM33
assembly.  Unfortunately, it didn't occur to me that the way I had
introduced it would cause `mov pc,non-address-register' to be accepted
too, and in such a way that would cause an incorrect instruction to be
encoded.  For example, `mov pc,r7' would silently be assembled as `mov
sp,r7'.  Oops.

Here's a patch that fixes the problem.  I've tried to introduce a
negative test for the inappropriately-supported instructions, but I
couldn't figure out how to do it.  I'd appreciate any clues/pointers
as to how to do it.  Thanks in advance.

Meanwhile, here's the patch.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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